Definition of glib adjective from the Oxford Advanced Learner's Dictionary

 

glib

 adjective
adjective
BrE BrE//ɡlɪb//
 
; NAmE NAmE//ɡlɪb//
 
(disapproving)
 
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(of speakers and speech) using words that are clever, but are not sincere, and do not show much thought a glib salesman glib answers He had assumed that his glib explanations would convince us. It would be glib to suggest that she did it deliberately. Word Origin late 16th cent. (also in the sense ‘smooth, unimpeded’): ultimately of Germanic origin; related to Dutch ‘slippery’ and German glibberig ‘slimy’.
See the Oxford Advanced American Dictionary entry: glib