glib
adjective uk/ɡlɪb/ us/ɡlɪb/ glibber | glibbest
花言巧语的，油嘴滑舌的;（说话）不诚恳的，未经思考的
speaking or spoken in a confident way, but without careful thought or honesty
He's a glib, self-centred man. 他是个油嘴滑舌、自私自利的人。
No one was convinced by his glib answers/explanations. 没有人相信他那信口开河的回答／解释。