Cowardly; lacking courage — behaving in a timid or craven way (often applied to people).
彼は責任を押し付けられると卑怯にも逃げ出してしまった。
When responsibility was thrust on him, he cowardly ran away.
卑怯な行為は信頼を失う原因になる。
Cowardly behavior can be a cause of losing trust.
怒鳴られるとすぐに黙るなんて、そんなのは卑怯だよ。
To immediately go quiet when shouted at — that's just cowardly.
Unfair, mean, or sneaky behavior — dirty or underhanded tactics.
相手をだます卑怯な手口は許されない。
Deceptive, underhanded tricks that cheat the opponent are unforgivable.
反則や陰口を言うのは卑怯だとみんなが非難した。
Everyone criticized the use of fouls and whispering behind backs as cowardly.
試合中に相手を踏みつけるなんて卑怯でスポーツマンらしくない。
Trampling the opponent during a match is mean and unsportsmanlike.