friendly or giving praise in a way that is not sincere and that is therefore unpleasant 谄媚的;油滑的;拍马奉迎的 an unctuous host 虚伪的主人
Word Originlate Middle English (in the sense ‘greasy’): from medieval Latin unctuosus, from Latin unctus ‘anointing’, from unguere ‘anoint’.