1Cowardly or craven — lacking the courage to face danger or difficulty; timid and gutless.
危険から仲間を置いて一人で逃げるなんて卑怯だ。
Abandoning your companions to danger and running off alone is cowardly.
卑怯にも彼は謝らずに黙って立ち去った。
In a cowardly way, he left without apologizing.
自分のミスを人のせいにするのは卑怯なやり方だ。
Blaming your own mistakes on someone else is a cowardly thing to do.
弱い者いじめをするのは卑怯者のすることだ。
Bullying the weak is something only a coward would do.
2Using sneaky, unfair, or underhanded methods instead of playing fair.
ルールを守らずに勝とうとするのは卑怯だ。
Trying to win without following the rules is unfair.
相手の弱点を利用して笑いものにするなんて卑怯だよ。
Exploiting someone's weakness to make fun of them is a dirty thing to do.
陰で悪口を言うのは卑怯なやり方だと思う。
I think talking badly about people behind their backs is a sneaky thing to do.