Etymology
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cacoethes (n.)

"itch for doing something," 1560s, from Latinized form of Greek kakoēthēs "ill-habit, wickedness, itch for doing (something)," from kakos "bad" (from PIE root *kakka- "to defecate") + ēthē- "disposition, character" (see ethos). Most famously, in Juvenal's insanabile scribendi cacoethes "incurable passion for writing."

updated on October 29, 2018

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Definitions of cacoethes from WordNet

cacoethes (n.)
an irrational but irresistible motive for a belief or action;
Synonyms: mania / passion
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.