Definition
A Latin maxim meaning "with felonious intent." The phrase describes the mental state — the specific criminal purpose — that must accompany an act for it to constitute a felony or a felony-grade offense. It signals that the actor did not merely cause harm incidentally but acted with a deliberate intention to commit a crime of the most serious class. In older common law pleading, animo felonico appeared as a term of art in indictments to aver that the accused acted with the requisite criminal mind, distinguishing felonious conduct from acts that were merely tortious, accidental, or of lesser criminal grade.
The phrase belongs to a family of Latin animus constructions used to specify intent in legal instruments. Animus, the root, means mind, will, or intention. Felonico (from "felonious") identifies the quality of that intent — one directed toward the commission of a felony. Together the phrase does the work that modern criminal law accomplishes with terms like "specific intent," "mens rea," or the statutory phrase "with intent to."
Common Confusion
Animo felonico is sometimes loosely treated as synonymous with mens rea or criminal intent generally. The distinction matters: mens rea is a broad concept covering the entire spectrum of culpable mental states (purpose, knowledge, recklessness, negligence). Animo felonico is narrower — it specifically designates intent at the felony level, excluding lesser criminal purposes. A person acting with general criminal intent, or with intent to commit a misdemeanor, does not act animo felonico in the strict sense. Researchers encountering the phrase in historical indictments should not read it as a generic mental-state averment.
Why It Matters in Research
This is primarily a term of historical pleading, not modern doctrine. Researchers are most likely to encounter animo felonico in pre-twentieth-century indictments, court opinions citing those indictments, and common law treatises discussing the formal requirements of felony charges. Its presence in a document is a reliable signal that the instrument was drafted under strict common law pleading rules that required explicit averment of criminal intent — a practice largely displaced by simplified pleading codes (beginning with the Field Code of 1848 in New York and spreading through state and federal reform thereafter).
Two research traps deserve attention. First, the absence of the phrase in a historical indictment does not necessarily mean intent was not required — courts sometimes implied felonious intent from other language in the charging document. Second, because the phrase was a pleading formula, its appearance does not resolve the underlying factual question of whether the defendant actually harbored felonious intent; it is an averment, not a finding.
Researchers tracing the felony-misdemeanor distinction through historical sources will find animo felonico a useful marker for how courts and pleaders understood that divide at common law. The phrase clusters with related concepts — malice aforethought in homicide, animo furandi (intent to steal) in larceny — and tracking its usage across jurisdictions can illuminate when and how American courts began relaxing strict pleading requirements.
Historical Dictionary Support
The three source dictionaries agree completely on the core definition: "with felonious intent." Both editions of Black's cite Hobart 134 — a reference to Sir Henry Hobart's reports of early seventeenth-century English common law decisions — as authority, grounding the phrase firmly in classical common law pleading. Bouvier adds the broader animus entry, noting that animus means "the intention with which an act is done," which usefully situates animo felonico within the larger Latin intent vocabulary of common law.
None of the historical sources elaborate on how the phrase functioned in practice — what words surrounding it in an indictment were necessary, how courts treated defective averments, or when the requirement fell away. Researchers needing that operational detail will need to go beyond the dictionary sources to pleading treatises such as Chitty's Criminal Law or Stephen's Principles of Pleading.
Jurisdictional Note
As a common law pleading term, animo felonico applied across English and early American jurisdictions that followed strict indictment requirements. American jurisdictions that adopted simplified criminal pleading codes through the nineteenth and twentieth centuries rendered the formal phrase obsolete in practice, though courts continued to cite it when interpreting historical documents or tracing the elements of common law offenses.