Definition of light-headed
(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"
lacking seriousness;
given to frivolity; "a
dizzy blonde"; "light-headed teenagers"; "silly giggles"