idiosyncrasy.
A behavior or way of thinking that is characteristic of a person or a group.
Meaning & usage
A behavior or way of thinking that is characteristic of a person or a group.
A peculiar individual reaction to a generally innocuous substance or factor; a risk factor.
A peculiarity that serves to distinguish or identify.
He mastered the idiosyncrasies of English spelling and speech.
Where this word comes from
First attested in 1604, in modern sense since 1665, from Ancient Greek ἰδιοσυγκρασία (idiosunkrasía, “one’s own temperament”), from ἴδιος (ídios, “one’s own”) + σύν (sún, “together”) + κρᾶσις (krâsis, “temperament”). By surface analysis, idio- + syn- + -crasy.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.