做这种事是懦弱的行为。This was a cowardly thing to do.他真是个懦弱的年轻人.He is really a wet young man.就是那最懦弱的胆小鬼也会接受这种挑战.The veriest coward would accept the challenge....

“懦弱的”的英语可以翻译为：cowardly，fainthearted，weakling，white-livered，milk-livered ...