From Longman Dictionary of Contemporary Englishflightyflight‧y /ˈflaɪti/ adjective CHANGE/BECOME DIFFERENTsomeone who is flighty changes their ideas and opinions often, and only remains interested in people or things for a short time – used in a disapproving way, especially about women
Examples from the Corpus
flighty• A tendency towards rather flighty behaviour in the breed is being overcome by careful selection.• But she was not in the flighty, dumb-blonde mould.• She was a good looker, if a bit flighty for these parts.• The lady had always been a bit flighty in her mind - nervous, delicate, taking odd fancies. 