lightheaded

[ lahyt-hed-id ]

/ ˈlaɪtˈhɛd ɪd /

giddy, dizzy, or delirious: After two drinks Pat began to feel lightheaded.

having or showing a frivolous or volatile disposition; thoughtless: lightheaded persons.

Origin of lightheaded

First recorded in 1530–40; light² + head + -ed³

light·head·ed·ly, adverb light·head·ed·ness, noun

Same goes for anyone who has low blood pressure or tends to get light-headed easily.

5 Healthier Ways to Detox (That Aren’t Juice Cleanses) |DailyBurn |February 20, 2014 |DAILY BEAST
I verily believe that at times I was light-headed in a sort of languid way.

A Personal Record |Joseph Conrad
He felt so light-headed that it might have been easy now for d'Ucello to extract admissions from him.

The Saracen: The Holy War |Robert Shea
Had he let out any thing to compromise himself when he was light-headed with the fever the night before?

Man and Wife |Wilkie Collins

Exhaustion had him light-headed, and his lips were cracked from thirst.

Deathworld |Harry Harrison
Ah, poor old man—last night—light-headed—fancies and nonsense of an old man—why don't you laugh at it?

After Dark |Wilkie Collins

light-headed

frivolous in disposition or behaviour

giddy; feeling faint or slightly delirious

light-headedly, adverb light-headedness, noun