Crossword Genius

Frivolous — unstable (5)

Ross

I believe the answer is:

giddy

This clue is a double definition.

'frivolous' is the first definition.
(similar in meaning)

'unstable' is the second definition.
(thesaurus)

(Other definitions for giddy that I've seen before include "Suffering from vertigo" , "Sturdy" , "Dizzy or frivoloous" , "Frivolous -- liable to fall" , "Faint - excited" .)

I've seen this clue in The Guardian.
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