lightheaded

[lahyt-hed-id]
adjective
1.
giddy, dizzy, or delirious: After two drinks Pat began to feel lightheaded.
2.
having or showing a frivolous or volatile disposition; thoughtless: lightheaded persons.

Origin:
1530–40; light2 + head + -ed3

lightheadedly, adverb
lightheadedness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
lightheaded

adjective
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
2. lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles" [syn: airheaded
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Damage to the nerves to your heart may cause you to feel lightheaded, or faint, when you stand up.
Feeling lightheaded, especially when getting up quickly.
Traumatic stress reactions often include feeling your heart pounding and feeling lightheaded or spacey.
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