The Collaborative International Dictionary of English v.0.48:
ill-gotten \ill-gotten\ adj. obtained illegally or by improper means; as, ill-gotten gains. Syn: dirty. [WordNet 1.5] ill-humoredWordNet (r) 3.0 (2006):
ill-gotten adj 1: obtained illegally or by improper means; "dirty money"; "ill-gotten gains" [syn: dirty, ill-gotten]