From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cacoethes \Cac'o*["e]"thes\, noun [L., fr. Gr. ???????? of ill habits, ?? ???????? an ill habit; kako's bad + ? habit]
1. A bad custom or habit; an insatiable desire; as, caco["e]thes scribendi, ''The itch for writing''. --Addison.
2. (Med.) A bad quality or disposition in a disease; an incurable ulcer.
From WordNet (r) 2.0 [wn]:
noun
1: an irrational but irresistible motive for a belief or action [syn: {mania}, {passion}]
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