What does nonlethal mean?
Nonlethal means that something does not cause or intend to cause death. The word is commonly used of weapons, security equipment, methods of control, medical treatments, and other interventions. A nonlethal weapon, for example, may cause pain, bruising, burns, or other injuries, but it is designed to incapacitate or restrain a person without killing them. Consequently, nonlethal should not be confused with harmless or completely safe. In law enforcement and military contexts, the term often describes equipment intended to reduce deaths compared with conventional force. It is also used more generally to characterize treatments or procedures that are expected to spare the patient’s life. The prefix non- combines with lethal, meaning deadly or causing death, to form an adjective emphasizing the absence of fatal outcomes while allowing the possibility of significant nonfatal harm.
adjectiveNot causing or intended to cause death. A nonlethal weapon or method may still cause pain, injury, or other serious effects.
- Not causing or intended to cause death.
"The police used a nonlethal device to control the crowd without causing fatalities."
"The defenders were equipped with nonlethal weapons for controlling the disturbance."
"The treatment is nonlethal, although it can cause temporary discomfort."
Nonlethal does not mean harmless: it describes an approach that avoids death while potentially causing serious injury.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nonlethal come from?
Nonlethal is a modern English compound formed from the prefix non-, meaning not, and lethal, meaning deadly or causing death. Lethal comes through Middle English from Latin lethalis, derived from letum, meaning death. The compound has been used in English since the 19th century in discussions of weapons, medicine, and methods of causing or avoiding death. The related words lethal and lethality preserve the same Latin root.
Related word forms
How nonlethal is actually used
The term is especially common in discussions of weapons, law enforcement, medicine, and technology. It generally implies that death is not the intended or expected result, but it does not imply that the consequences are minor.