Akademik

flippant
adjective /ˈflɪ.pənt/
a) glib.

In the mid-1950s we both wrote for the same weekly, where her contributions were a good deal more serious and less flippant than mine.

b) nimble; limber.

The conversations had grown more adult over the years—she was less flippant, at least.

Ant: serious

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