Open English Wordnet
Adjectives
(s)faint, light, swooning, light-headed, lightheadedweak and likely to lose consciousness“suddenly felt faint from the pain”, “was sick and faint from hunger”, “felt light in the head”, “a swooning fit”, “light-headed with wine”, “light-headed from lack of sleep”
(s)airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, sillylacking seriousness; given to frivolity“a dizzy blonde”, “light-headed teenagers”, “silly giggles”