What does tranquilize mean?
Tranquilize is a verb meaning to make a person, animal, or situation calm and peaceful. In medical contexts, it often describes calming a patient with a sedative, while in figurative use it refers to reducing fear, anger, or tension. The word can also be used intransitively, though less often, for becoming tranquil. Its closest everyday synonyms include calm, soothe, pacify, and placate; in formal or diplomatic contexts, tranquilize can suggest deliberate suppression of agitation rather than removal of its cause. This nuance makes the verb useful in writing about medicine, emotional control, public safety, and negotiation. An idiom such as “tranquilize the waters” captures its figurative power: it presents the act of making a tense situation calmer. Tranquilize is also linguistically notable as a verb paired with the adjective tranquil and the noun tranquility, all reflecting the idea of being undisturbed.
verbTo make someone or something calm, peaceful, or free from agitation. Less commonly, it means to become calm.
- To make or cause to become calm, peaceful, or free from agitation.
"The doctor used a mild sedative to tranquilize the agitated patient."
"A few minutes of quiet music helped tranquilize the restless crowd."
"The negotiator's calm proposal helped tranquilize the atmosphere."
“Tranquilize the waters” turns a medical-sounding verb into diplomatic shorthand for calming a tense situation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tranquilize come from?
The English verb was formed in the 19th century from tranquility or the related form tranquil plus the suffix -ize. Tranquil comes through French from Latin tranquillus, meaning “calm” or “undisturbed,” while tranquility continues the Latin noun tranquillitas. English cognates such as tranquility and tranquillity preserve the same Latin source, even though their spellings and stress patterns differ.
Related word forms
How tranquilize is actually used
The verb is most often transitive, meaning “to make calm,” although it can also be used intransitively to mean “to become tranquil.” British English commonly uses the spelling “tranquillise,” while “tranquilize” is standard in American English. Medical and formal figurative uses are both well established.
Easily confused with tranquilize
Tranquil is an adjective describing something that is already calm, whereas tranquilize is a verb describing the act of making something or someone calm.