The Frenchman spoke excellent, irreproachable English.那位法国人操一口无懈可击的完美英语。Her conduct throughout was irreproachable.她的表现自始至终无可挑剔。His conduct as a police officer was irreproachable.作为一名警官，他的行为无可挑剔。It emerges that her past behaviour was far from irreproachable.真相暴露了，她过去的行为远不是无可指摘的。