cowardly
adj. 怯懦的,胆小的;恃强凌弱的
adv. <古>胆怯地,怯懦地
例句
He was weak, cowardly and treacherous.
他软弱、胆怯、奸诈。
《牛津词典》
I was too cowardly to complain.
我胆小得都不敢抱怨。
《柯林斯英汉双解大词典》
This was a cowardly thing to do.
做这种事是懦弱的行为。