adverse
英検準1級不利な・有害な（副作用）
意味
- 反対の,逆の
- 逆方向の
例文
Is there any adverse reaction?
副作用はありませんか。
語源
英語の原文（Wiktionary）
First attested around 1374, from Old French avers (French adverse), from Latin adversus (“turned against”), past participle of advertere, from ad- (“to”) + vertere (“to turn”). See also versus.