Open English Wordnet
Nouns
Adjectives
(s)airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, sillylacking seriousness; given to frivolity“a dizzy blonde”, “light-headed teenagers”, “silly giggles”
(s)pathetic, ridiculous, sillyinspiring scornful pity“how silly an ardent and unsuccessful wooer can be especially if he is getting on in years” (Dashiell Hammett)
(s)punch-drunk, silly, slaphappydazed from or as if from repeated blows“knocked silly by the impact”, “slaphappy with exhaustion”, “punch-drunk with love”