IPA: //kækoʊˈiːθiz//
KK: /kækoʊˈiːθiz/
A strong and uncontrollable urge or desire to do something, often considered harmful or excessive.
His cacoethes for gambling led him to lose all his savings.
Cacoethes is formed from "caco-" (from Greek "kakos", meaning bad or evil) and "ethes" (from Greek "ēthos", meaning character or habit). The word describes a bad habit or an uncontrollable urge, particularly one that is harmful or detrimental.
Think of 'bad' ('caco-') habits or urges that affect your 'character' ('ethos') — that's what cacoethes means.