Main Entry: ad·verse

Pronunciation: \ad-ˈvərs, ˈad-ˌ\

Function: adjective

Etymology: Middle English, from Anglo-French advers, from Latin adversus, past participle of advertere

Date: 14th century

1 : acting against or in a contrary direction : hostile <hindered by adverse winds>
2 a : opposed to one's interests <an adverse verdict> <heard testimony adverse to their position>; especially : unfavorable <adverse criticism> b : causing harm : harmful <adverse drug effects>
3 archaic : opposite in position

— ad·verse·ly adverb

— ad·verse·ness noun