1. To make dizzy or unsteady.
  2. To reel; to whirl.


  1. Dizzy, feeling dizzy or unsteady and as if about to fall down.
    The man became giddy upon standing up so fast.
  2. Causing dizziness: causing dizziness or a feeling of unsteadiness.
    They climbed to a giddy height.
  3. Lightheartedly silly, or joyfully elated.
    The boy was giddy when he opened his birthday presents.
  4. Frivolous, impulsive, inconsistent, changeable.

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