Definition
Ordinary negligence is the failure to exercise the degree of care that a reasonably prudent person would exercise under the same or similar circumstances. It is the baseline standard of care in tort law — the default measure against which conduct is judged when no special relationship, heightened duty, or statutory standard applies.
The standard is objective: courts ask not what the specific defendant intended or believed, but what a hypothetical reasonable person would have done. If the defendant's conduct falls below that standard and causes harm, ordinary negligence is established.
Ordinary negligence is distinguished from gross negligence, which involves a conscious or reckless disregard of others' rights or safety, and from slight negligence, a degree of carelessness below ordinary negligence used in a small number of jurisdictions and older common law frameworks.
---
Common Language
Modern common usage (Wiktionary): "Negligence" in ordinary speech means carelessness or inattention — failing to take proper care over something.
Historical common usage (Webster's 1913): "Negligence" is defined as the omission of proper attention; habitual neglect; the quality or state of being negligent.
The gap matters here: in everyday speech, "ordinary negligence" might suggest run-of-the-mill carelessness without legal consequence. In law, the word "ordinary" is a term of art that locates conduct on a formal spectrum — ordinary, slight, and gross — and carries specific doctrinal weight for determining liability, the enforceability of exculpatory clauses, and the availability of certain defenses. A waiver clause that releases a party from "ordinary negligence" means something precise in a legal instrument; it does not mean "everyday mistakes."
---
Common Confusion
ORDINARY NEGLIGENCE vs. GROSS NEGLIGENCE: These terms describe distinct points on a spectrum, but they are frequently conflated in contracts, insurance policies, and judicial opinions. Ordinary negligence requires only a departure from the reasonable person standard. Gross negligence requires something more — conscious indifference, recklessness, or an extreme departure from the standard of care. The distinction is consequential: many jurisdictions refuse to enforce contractual waivers of gross negligence, while permitting waivers of ordinary negligence in appropriate contexts. Punitive damages are rarely available for ordinary negligence alone.
ORDINARY NEGLIGENCE vs. NEGLIGENCE PER SE: Negligence per se arises when a defendant violates a statute designed to protect a class of persons from a specific type of harm. Rather than applying the reasonable person standard, the court treats the statutory violation as establishing the breach element automatically. A researcher analyzing a negligence claim must determine which standard governs — the general reasonable person inquiry or the per se rule — because these lead to different analytical paths and different evidentiary burdens.
---
Core Elements
Courts and pattern jury instructions consistently organize ordinary negligence around four elements:
1. DUTY — The defendant owed the plaintiff a legal duty of care. The scope of that duty is shaped by the relationship between the parties, foreseeability of harm, and applicable law.
2. BREACH — The defendant failed to act as a reasonably prudent person would have acted under the circumstances. This is the element that "ordinary negligence" specifically defines.
3. CAUSATION — The breach was both the actual cause (but-for causation) and the proximate cause of the plaintiff's harm.
4. DAMAGES — The plaintiff suffered actual, cognizable harm as a result.
The reasonable person standard governs the breach element. It is worth noting that "ordinary negligence" as a phrase most precisely names the breach standard, not the full cause of action.
---
Why It Matters in Research
The phrase "ordinary negligence" is most operationally significant in three research contexts:
First, comparative fault and damages allocation. When a jurisdiction uses a comparative fault framework, determining whether conduct rises to gross versus ordinary negligence affects damage caps, the enforceability of indemnity provisions, and whether a party can recover at all under modified comparative fault rules.
Second, exculpatory clauses and waivers. Courts routinely distinguish whether a contractual release covers ordinary negligence, gross negligence, or willful misconduct. Many jurisdictions enforce waivers of ordinary negligence while voiding waivers of gross negligence as against public policy. A researcher examining a release or indemnification clause must locate the jurisdiction's rule on this distinction.
Third, historical sources use tiered negligence language — slight, ordinary, gross — that has largely fallen out of modern American practice but survives in some states and in older case law. Bouvier's entry reflects this framework. When reading 19th and early 20th century cases, particularly from jurisdictions that applied bailment-era negligence tiers, the term "ordinary negligence" had a more formal structural role than it does today. Modern courts mostly operate with a single reasonable person standard, reserving "gross negligence" as an aggravated category. Researchers should not assume that historical discussions of "ordinary negligence" map cleanly onto modern doctrine without checking the jurisdiction's current approach.
The term also appears in insurance policy interpretation, statutory immunity provisions (especially for volunteers and governmental actors), and professional liability contexts where the standard of care is modified by expertise.
---
Historical Dictionary Support
Bouvier's Law Dictionary defines ordinary negligence as "the want of such care and diligence as reasonably prudent men, generally, in regard to the subject-matter of inquiry, would use to prevent or avoid an injury," citing a Kansas decision.
This definition is consistent with the modern formulation in its core — the reasonable prudent person standard — but reflects the older tiered framework in which ordinary negligence occupied the middle position between slight and gross negligence. Bouvier's cross-reference to GROSS NEGLIGENCE is instructive: the entry was conceived relationally, as a degree on a spectrum rather than a freestanding concept.
What the historical dictionaries do not capture is the later doctrinal shift in most American jurisdictions away from the three-tier system toward a unified reasonable care standard. The tripartite scheme was heavily used in bailment law and some early tort frameworks, and its remnants persist in scattered statutory contexts. Researchers relying solely on Bouvier's framing may find it incomplete for modern analysis but genuinely useful for interpreting historical instruments and older decisions.
---
Jurisdictional Note
Most U.S. jurisdictions have collapsed the slight-ordinary-gross tripartite framework and apply a single reasonable person standard as the default, with gross negligence serving as an aggravated category. A few states retain formal distinctions for specific contexts — bailments, recreational use statutes, and governmental immunity provisions among them. Researchers analyzing statutory immunity provisions or contract waivers should verify the controlling jurisdiction's current approach before relying on the three-tier framing.
---
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
---