"lightheaded" in the adjective sense
1. faint, light, swooning, light-headed, lightheaded
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"
2. airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
lacking seriousness given to frivolity
"a dizzy blonde"
"light-headed teenagers"
"silly giggles"
Source: WordNet® (An amazing lexical database of English)
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