[adj] lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles"
[adj] 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"
Synonyms
airheaded, dizzy, empty-headed, faint, featherbrained, frivolous, giddy, ill, light, light-headed, sick, silly, swooning