Origins
The word "injury" reveals a striking semantic journey from the abstract world of law to the concrete reality of bodily harm. It entered English around 1380 from Anglo-French "injurie," from Latin "iniūria," a compound of the negative prefix "in-" and "iūs" (genitive "iūris"), meaning right, law, or justice. An injury was, at its core, something "not right" — a violation of what was just or lawful.
The Latin root "iūs" is one of the foundational words of Western legal civilization. From it descended an enormous family of legal terms: "justice" (iūstitia), "jury" (from iūrāre, to swear an oath), "jurisdiction" (iūris + dictiō, the speaking of the law), "jurisprudence" (iūris + prūdentia, knowledge of the law), and "just" itself. The Proto-Indo-European root *h₂yew- carried meanings relating to vital force, sacred law, and binding custom.
When Romans spoke of "iniūria," they meant primarily a legal wrong — an offense against someone's rights. Roman law recognized several categories of iniūria, including assault, insult, and trespass. The Lex Aquilia, a Roman statute from around 286 BCE, dealt specifically with iniūria to property and persons, establishing principles of damages that still influence tort law today.
Middle English
Old French and Anglo-French preserved this legal emphasis. When the word entered Middle English, "injurie" meant a wrong, injustice, or insult rather than physical harm. A person could suffer injury to their reputation or their rights without any physical contact. This sense survives in legal English: "personal injury law" covers not only physical harm but also emotional distress, defamation, and other non-physical wrongs.
The shift toward the physical-harm meaning occurred gradually during the 15th and 16th centuries. By Shakespeare's time, "injury" could mean both a wrong and a wound. The physical sense eventually became dominant in everyday speech, though the legal sense never disappeared.
The verb "injure" is a back-formation from "injury," appearing in the late 16th century. Before that, the verb form was "to do injury to" someone. The adjective "injurious" (harmful, damaging) came directly from Latin "iniūriōsus" through French.
Latin Roots
In modern medicine and sports, "injury" is almost exclusively physical. Doctors speak of "soft tissue injuries," "traumatic brain injuries," and "repetitive strain injuries." In football (soccer), "injury time" — the minutes added to compensate for stoppages during play — has become such a standard term that most speakers never consider its etymological connection to Roman law.
The legal sense persists in formal contexts. Lawyers distinguish between "injury" (the harm suffered) and "damages" (the monetary compensation). In tort law, "injury" can encompass economic loss, emotional suffering, loss of consortium, and other non-physical harms, staying closer to the original Latin meaning.
Interestingly, the word "injure" has a near-synonym in "harm," which comes from Old English "hearm" (via Germanic roots). English thus has parallel vocabulary from its two main source streams: the Latinate "injury/injure" and the Germanic "harm/hurt." In everyday speech these are largely interchangeable, but in legal and medical registers, the Latinate forms carry more formal weight.
Modern Legacy
The phrase "add insult to injury" dates from the 18th century in English, though the concept goes back to the Roman fabulist Phaedrus (1st century CE), who wrote a fable about a bald man swatting at a fly on his head and striking himself. The fly remarks that the man has added injury (the self-inflicted blow) to insult (the fly's impudence).