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say it: lahyt-HED-uhd
lightheaded is an adjective meaning "weak and likely to lose consciousness". It carries 2 recorded senses.
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”
Definitions, synonyms and semantic relations for lightheaded come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.