lightheaded

/ˈlaɪtˌhɛdɪd/

Other forms: lightheadedly

If you're lightheaded, you're dizzy and faint, and you might need to sit down for a minute. The sight of enormous spiders makes some people feel lightheaded.

Standing up quickly can make you lightheaded, and you can also make yourself lightheaded by forgetting to eat lunch or blowing up a huge balloon with one breath. Being lightheaded, while usually not a serious condition, is typically caused by a temporary shortage of oxygen or blood getting to the brain. The word dates from the sixteenth century.

Definitions of lightheaded

1. adjective

   weak and likely to lose consciousness
   synonyms: faint, light, light-headed, swooning

   ill, sick

   affected by an impairment of normal physical or mental function
2. adjective

   lacking seriousness; given to frivolity
   synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, silly

   frivolous

   not serious in content or attitude or behavior