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cowardly; craven
unfair; mean; sneaky; dirty; dastardly
卑怯な手を使って勝つのは恥ずかしい。
It's shameful to win using cowardly methods.
彼の卑怯な行動にみんなが怒っていた。
Everyone was angry at his cowardly behavior.
卑怯者とは呼ばれたくないから正々堂々と戦う。
I'll fight fair because I don't want to be called a coward.