mad; foolish

silly

likely to become different

erratic

(of a person) often changing one's feelings about another person

vacillating, blowing hot and cold

not showing deserved respect

irreverent

not serious or important; enjoying pleasure (too much)

trivial, silly

causing, having, the feeling that everything is turning round so that one cannot stand steady

silly, impulsive

snobbish and arrogant

pompous

(especially) (doing things, done) without a proper sense of responsibility

careless, reckless

behaving as if a little mad

giddy

not sensible; foolish

absurd, giddy, foolish

(of a liquid) that easily changes into gas or vapour; (of a person, mood) changing quickly or easily from one mood or interest to another

explosive, changeable

not easily controlled or guided

contrary, unmanageable