cacoëthes
noun
an irresistible urge; mania.
First recorded in 1555–65; from Latin, from Greek kakóēthes, neuter (used as noun) of kakoḗthēs “malignant,” literally, “of bad character”; see caco-, ethos
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.