Adjective: lightheaded ,lIt'he-did
- Weak and likely to lose consciousness
"suddenly felt lightheaded from the pain";
- faint, light, swooning, light-headed
- Silly, frivolous, or lacking seriousness
"Her lightheaded behaviour made it hard to take her seriously";
- airheaded [informal], dizzy, empty-headed, featherbrained, giddy, light-headed, silly
See also: frivolous, ill, sick
Encyclopedia: Lightheaded