serious-minded Antonyms

absurd coocoo crackbrained cray cray four sheets in the wind four sheets to the wind three sheets in the wind as silly as a goose silly as a goose one sandwich short of a picnic sheet in the wind beyond all reason as daft as a brush chuckle-headed cockle-brained cockle-headed coo-coo chowderheaded away with the fairies batty brainless clever crayfish cray crazy cuckoo daft light-minded stupid barmy goofy as a joke three sheets to the wind akamai pulling one's leg