Superlative form of flighty: most flighty.(adjective)
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Use "flightiest" in a sentence
"Especially when such a message would essentially be directed at Stoudemire and Marion, who come off as the flightiest guys on the team mood-wise."
"He describes the decorations of the Capitol and how "not in one's flightiest dreams has there been so much marble and china, gold and bronze, so many painted gods and goddesses.""
"He went to look at the last pushpots, and they were ready to be taken over to their flightiest before use."