adj 1: 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" [syn: faint, light, swooning, light-headed]
2: lacking seriousness; given to frivolity; "a dizzy blonde";
"light-headed teenagers"; "silly giggles" [syn: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, silly]