glib
adjective
glibber; glibbest
1 a: showing little forethought or preparation : offhand
glib answers
b: marked by ease and informality : nonchalant
c: lacking depth and substance : superficial
glib solutions to knotty problems
2: marked by ease and fluency in speaking or writing often to the point of being insincere or deceitful
a glib politician
3 archaic: smooth, slippery