light-headed

adjectives

weak 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"

faint, light, light-headed, lightheaded, swooning

lacking seriousness; given to frivolity

"a dizzy blonde"; "light-headed teenagers"; "silly giggles"

airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly