First used in English around 1540–50. From Latin Cynicus (cynic philosopher), from Ancient Greek Κυνικός (Kunikós, from κύων (kúōn, “dog”, see Proto-Indo-European *ḱwṓ) + -ικός (-ikós), literally “doglike, currish”). The word may have first been applied to Cynics because of the nickname κύων (kúōn, “dog”) given to Diogenes of Sinope, the prototypical Cynic.