frivolously disrespectful, shallow, or lacking in seriousness; characterized by levity

The audience was shocked by his flippant remarks about patriotism.

Chiefly Dialect . nimble, limber, or pliant.

Archaic . glib; voluble.

adjective

courteous , respectful , reverent , serious

adjective

brassy , breezy , cheeky * , cocky , disrespectful , flighty , flip * , fresh , frivolous , glib , impertinent , impudent , insolent , lippy , nervy * , offhand , pert , playful , rude , sassy * , smart * , smart-alecky , superficial , airy , bold , brazen , chatty , fluent , forward , irreverent , malapert , sassy , saucy , talkative , voluble