他现在把那当作轻率的随口一说不再理会了。He now dismisses that as a flippant comment.有些人往往作出轻率的结论.Some people are prone to jump to hasty conclusions.他的敌人企图以轻率的审判使他坐牢.His enemies tried to railroad him to prison without a fair trial....

“轻率的”的英语可以翻译为：imprudent，rash，unadvised，thoughtless，headlong ...