flighty
adjectiveUK /ˈflaɪti/
US /ˈflaɪti/
Someone who is flighty changes their mind a lot and does not stay serious for long.
My flighty cousin never keeps a job for more than a month.
OTHER MEANINGS
2. Easily excited or distracted, like a nervous bird.
The flighty puppy ran from one toy to another.
3. Not steady or dependable in behavior or feelings.
His flighty promises made no one trust him.
4. Quick to take fright or fly away.
The flighty horse bolted at the sound of thunder.