glib
adjectiveUK /ɡlɪb/
US /ɡlɪb/
Speaking in a smooth, easy way that is not honest or sincere.
The salesman's glib answers made me doubt he was telling the truth.
OTHER MEANINGS
2. Speaking easily and fluently, sometimes without much thought.
She gave a glib reply without really considering the question.
3. Done or said in a quick, offhand way that seems careless.
His glib dismissal of the problem annoyed everyone at the meeting.
4. Smooth and slippery in a literal sense, as of a surface.
The glib ice made walking across the pond dangerous.