glIb
adjective
speaking or prone to speak easily and fluently, esp. in a careless or thoughtless manner, with little concern for the truth.
Don’t let any glib salesman talk you into making up your mind too quickly.
2. spoken or performed in an offhand manner, with ease or fluency.
The job candidate’s answers to our interview questions were glib, but she stumbled when asked what she knew about the company.
3. careless, thoughtless, or insincere.
She’s become so disrespectful lately that she gives me nothing but glib responses even when I ask her a serious question.