adj.無(wú)自信的；客客氣氣的；羞怯的
He was too diffident to express his opinion. 他太不自信，不敢發(fā)表自己的見解。
She is diffident about expressing her opinions. 她怯于表述自己的意見。
He has a politely diffident manner. 他的態(tài)度是客氣中帶有羞怯。
adv.膽怯地；羞怯地
