卑怯な

cowardly; underhanded

→ 卑怯だ
phrase Rare #29,158
cowardly; underhanded A な-adjective describing cowardly, sneaky, or unfair behavior. The form 卑怯だ is used at the end of a sentence, while 卑怯な comes before a noun.
JA: 卑怯な手を使うな。
EN: Don't use underhanded tactics.

卑怯なあなたには無理よ

You can't do it—you’re too cowardly.

— 暗殺の森 (1971)

俺の記憶を消すとはお前は卑怯な野郎だ

You're a cowardly bastard for erasing my memories.

— オールド・ボーイ (2003)

卑怯なまねしないでよ

Don't fight dirty.