" lightheaded "

1: having a feeling of being whirled about and in danger of falling down;

  * e.g., " ... I always get light-headed after riding roller coasters, even when I'm standing still again "

•  Synonyms : 

•  aswoon,

•  dizzy,

•  giddy,

•  reeling,

•  swimmy,

•  vertiginous,

•  whirling,

•  woozy

•  Antonyms : 

•  earnest,

•  serious,

•  serious-minded,

•  sober,

•  unfrivolous

2: lacking in seriousness or maturity;

  * e.g., " ... we couldn't concentrate on our work because we were feeling so light-headed "

•  Synonyms : 

•  birdbrained,

•  ditzy,

•  dizzy,

•  featherbrained,

•  flighty,

•  frivolous,

•  frothy,

•  futile,

•  giddy,

•  goofy,

•  harebrained,

•  light-minded,

•  puerile,

•  scatterbrained,

•  silly,

•  yeasty

•  Antonyms : 

• (N/A)