What are the best answers for “lacking seriousness; given to frivolity”?

airheaded, dizzy, featherbrained, giddy, lightheaded.

How many letters does the top answer for “lacking seriousness; given to frivolity” have?

The most common answer is airheaded (9 letters).

5 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

airheaded 9 letters wn-def

lacking seriousness; given to frivolity

dizzy 5 letters wn-def

make dizzy or giddy

featherbrained 14 letters wn-def

lacking seriousness; given to frivolity

giddy 5 letters wn-def

lacking seriousness; given to frivolity

lightheaded 11 letters wn-def

lacking seriousness; given to frivolity