Definition
Negligence is the failure to exercise the degree of care that a reasonable and prudent person would exercise under the same or similar circumstances — whether by doing something a reasonable person would not do, or by failing to do something a reasonable person would do. It is the foundational concept of tort liability for unintentional harm and appears in criminal law as well, though with a higher threshold.
Negligence is not a single act but a relational standard: conduct is measured against what the situation demanded, not against what the actor intended. Neither malice nor recklessness is required. The absence of intent is what distinguishes negligence from intentional torts; the absence of conscious disregard for risk is what distinguishes ordinary negligence from recklessness.
In tort law, negligence functions both as a cause of action and as a defense. As a cause of action, a plaintiff must establish that the defendant owed a duty of care, breached that duty, and that the breach caused cognizable harm. As a defense, contributory negligence — the plaintiff's own failure of care — has historically operated to bar or reduce recovery.
Common Language
Modern common usage (Wiktionary): The state of being negligent; the tort whereby a duty of reasonable care was breached causing damage; any conduct short of intentional or reckless action that falls below the legal standard for preventing unreasonable injury.
Historical common usage (Webster's 1913): The quality or state of being negligent; lack of due diligence or care; omission of duty; habitual neglect; heedlessness.
The common-language definitions treat negligence as a character trait or habitual disposition — carelessness as a personal quality. The legal definition is situational and objective: it asks what a reasonable person would have done in this specific circumstance, not whether the actor is generally a careless person. A habitually careful person can be negligent in a single act; a habitually careless person may not be negligent if the specific circumstances demanded nothing more than they provided.
Common Confusion
NEGLIGENCE, RECKLESSNESS, AND GROSS NEGLIGENCE
Negligence, recklessness, and gross negligence occupy a continuum but are legally distinct. Ordinary negligence involves inadvertent failure to meet a reasonable-care standard. Gross negligence involves a severe departure from that standard — sometimes described as a conscious indifference to consequences, though definitions vary by jurisdiction. Recklessness, in most modern formulations, requires conscious disregard of a known substantial risk, bridging negligence and intentional wrongdoing. The distinctions carry practical weight: punitive damages, criminal liability, and immunity statutes often turn on which category applies. Historical sources frequently use "gross negligence" without precision, and researchers should not assume consistency across courts or periods.
Core Elements
To establish negligence as a tort cause of action, four elements must be satisfied:
1. DUTY: The defendant owed the plaintiff a legally recognized obligation to conform to a standard of conduct. The scope of duty — to whom it is owed and under what circumstances — is a question of law.
2. BREACH: The defendant's conduct fell below the applicable standard of care. The standard is objective: what would a reasonable and prudent person have done under the same circumstances? Specialists are held to the standard of their profession or field.
3. CAUSATION: The breach must be both the actual cause (cause-in-fact, often tested by "but-for" analysis) and the proximate cause (legal cause, limiting liability to reasonably foreseeable consequences) of the plaintiff's injury.
4. DAMAGES: The plaintiff must have suffered actual, cognizable harm. Unlike intentional torts such as battery, nominal damages are generally unavailable in negligence — the harm must be real.
Recognized Forms
AND SUBTYPES
CONTRIBUTORY NEGLIGENCE: The plaintiff's own failure to exercise reasonable care for their own safety, which at common law completely barred recovery if it contributed to the injury as a proximate cause. The traditional rule has been largely replaced by comparative fault regimes in most American jurisdictions.
COMPARATIVE NEGLIGENCE: The modern replacement for contributory negligence in most jurisdictions, apportioning damages between plaintiff and defendant according to their respective degrees of fault. Two main variants exist: pure comparative fault (plaintiff recovers even if primarily at fault) and modified comparative fault (recovery barred above a threshold, typically 50% or 51%).
NEGLIGENCE PER SE: When a defendant violates a statute enacted to protect a class of persons from a particular type of harm, and the plaintiff is within that class and suffers that harm, some courts treat the statutory violation as negligence per se — establishing breach without further inquiry into the reasonableness of the conduct.
GROSS NEGLIGENCE: A substantially greater deviation from the reasonable-care standard than ordinary negligence, sometimes requiring a showing of conscious indifference or willful disregard. Significant in contexts involving punitive damages, immunity statutes, and limited-liability waivers.
PROFESSIONAL NEGLIGENCE (MALPRACTICE): Negligence by a person acting in a professional capacity, measured against the standard of care applicable to that profession rather than the general reasonable-person standard.
RES IPSA LOQUITUR: A doctrine permitting an inference of negligence where the nature of the accident, the defendant's exclusive control, and the absence of contributory conduct by the plaintiff make negligent causation the most probable explanation, even without direct evidence of the specific breach.
Why It Matters in Research
Negligence is the most litigated concept in the Law Mind corpus, and several navigational points are essential.
The reasonable-person standard evolved over time. Early sources — including the first edition of Black's and Bouvier's — frame negligence primarily in terms of omission and reference to "ordinary care" without fully developing the four-element structure modern readers expect. Researchers should not read modern doctrinal architecture back into historical materials.
The contributory negligence defense appears throughout the corpus in forms that modern American practice has substantially displaced. Historical sources treat contributory negligence as a complete bar to recovery. If your research involves cases or materials from before the 1970s, assume contributory negligence is the operative regime unless the source indicates otherwise. Comparative fault arrived jurisdiction by jurisdiction through statute and judicial decision beginning in the mid-twentieth century.
The distinction between negligence as a cause of action and negligence as a standard embedded in other doctrines matters for research navigation. Negligence appears inside products liability, professional malpractice, premises liability, and nuisance law, often under different names or without the four-element framing. The corpus indexes these separately — researchers pursuing negligence-based products liability claims should consult those subject-specific entries in addition to foundational negligence materials.
Negligence per se requires careful historical reading. Courts have varied significantly in whether statutory violation establishes negligence conclusively, creates a rebuttable presumption, or serves merely as evidence of negligence. The Law Mind encyclopedia entry on negligence per se addresses this variation directly.
Criminal negligence appears in historical sources alongside civil negligence without always distinguishing the two. The criminal standard generally requires a greater departure from ordinary care than civil negligence, but historical texts are inconsistent. When reading older criminal-law materials that invoke "negligence," verify which threshold the source is applying.
Historical Dictionary Support
The historical dictionaries converge on the core formulation but approach the standard from different angles, reflecting the doctrine's incremental development.
Black's Law Dictionary (1st Ed.) offers two distinct formulations that repay comparison. The first — drawn from the NitroGlycerin Case — defines negligence as "the omission to do something which a reasonable man, guided by those considerations which ordinarily regulate the conduct of human affairs, would do, or doing something which a prudent and reasonable man would not do." This bidirectional framing (acts and omissions both count) is the foundation of the modern definition. The second formulation, drawn from Cooley on Torts, emphasizes the relational duty: "the failure to observe, for the protection of the interests of another person, that degree of care, precaution, and vigilance which the circumstances justly demand, whereby such other person suffers injury." Black's 2nd Ed. reproduces these formulations with minimal revision, signaling doctrinal stability at the core even as surrounding rules evolved.
Rapalje & Lawrence takes a functional approach: "Negligence is want of proper care, and may consist in doing something which ought not to be done, or in not doing something which ought to be done." Rapalje is also useful for its early attention to the dual operation of negligence — as a source of liability and as a defense — noting that "negligence may operate either to create or to defeat a right of action."
The historical sources are notably less developed on causation. The duty-breach-causation-damages structure that organizes modern negligence doctrine is largely a twentieth-century pedagogical achievement. Researchers reading nineteenth-century cases or dictionary entries should not expect that framework to be explicit; causation is often treated as self-evident rather than analyzed as a separate element.
Bouvier's and Burrill's, where they address negligence, tend toward Roman-law comparisons (culpa) and gradations of care (slight, ordinary, great) that were influential in early American courts but have been substantially abandoned in favor of the unified reasonable-person standard. The tripartite structure of slight/ordinary/gross care appears in some historical corpus materials and may confuse researchers expecting the modern binary of reasonable versus unreasonable.
Jurisdictional Note
Comparative fault regimes now govern in the overwhelming majority of American jurisdictions, but the specific rules — whether pure or modified, and where the threshold falls — vary by state. Federal courts sitting in diversity apply the negligence law of the forum state. Common-law contributory negligence survives in a small number of American jurisdictions. Researchers working across jurisdictions or historical periods should confirm which regime applies before drawing conclusions from case law.
Encyclopedia Cross-Reference
Negligence — Negligence Per Se (Violation of Statute as Negligence) (The Law Mind Torts & Personal Injury Encyclopedia)
Negligence — Res Ipsa Loquitur (Inference of Negligence) (The Law Mind Torts & Personal Injury Encyclopedia)
Defenses to Negligence — Contributory Negligence (Traditional Rule) (The Law Mind Torts & Personal Injury Encyclopedia)