light-headed

Meanings

1. 1
   adj

   dizzy, faint, or mentally unsteady

   She felt light-headed after standing up too quickly.

2. 2
   adj

   thoughtless, frivolous, or carried away by excitement

   In a light-headed mood, he began devising ever more reckless schemes.

A compound of light in the senses 'not weighty' and 'lacking seriousness' with headed. The physical sense describes a head that feels insubstantial or unsteady; the figurative sense describes similarly unstable judgment.

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