light–headed

1 having a feeling of being whirled about and in danger of falling down I always get light-headed after riding roller coasters, even when I'm standing still again Synonyms aswoon, giddy, light-headed, reeling, swimmy, vertiginous, whirling, woozyRelated Words faint, weak; addled, befuddled, confused, dazed, groggyNear Antonyms clearheaded; stable, steady

2 lacking in seriousness or maturity we couldn't concentrate on our work because we were feeling so light-headed Synonyms birdbrained, ditzy (or ditsy), dizzy, featherbrained, flighty, frivolous, frothy, futile, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, silly, yeastyRelated Words fatuous, foolish, inane, nonsensical, thoughtless, witless; crazy, daffy, daft, fruity; exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful; sappy, shallow, superficialNear Antonyms grave, melancholy, somber (or sombre), thoughtful; dignified, heavy, no-nonsense, sedate, severe, solemn, staidAntonyms earnest, serious, serious-minded, sober, unfrivolous