- The definition of lightheaded is being frivolous or feeling dizzy or faint.
An example of lightheaded is a potential condition of a person after a concussion.
lightheaded definition by Webster's New World
- mentally confused or feeling giddy; dizzy
- not sensible; flighty; frivolous
lightheaded definition by American Heritage Dictionary
- Faint, giddy, or delirious: lightheaded with wine.
- Given to frivolity; silly.
- lightˈheadˈed·ly adverb
- lightˈheadˈed·ness noun