only 1 use
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- It showed Atticus barefooted and in short pants, chained to a desk: he was diligently writing on a slate while some frivolous-looking girls yelled, "Yoo-hoo!" at him.p. 155.3
frivolous = unserious
There are no more uses of "frivolous" in To Kill a Mockingbird.
Typical Usage (best examples)