Gid·dy a. [Compar. Giddier superl. Giddiest.]
  1. Having in the head a sensation of whirling or reeling about; having lost the power of preserving the balance of the body, and therefore wavering and inclined to fall; lightheaded; dizzy.
     By giddy head and staggering legs betrayed.   --Tate.
  2. Promoting or inducing giddiness; as, a giddy height; a giddy precipice.
     Upon the giddy footing of the hatches.   --Shak.
  3. Bewildering on account of rapid turning; running round with celerity; gyratory; whirling.
     The giddy motion of the whirling mill.   --Pope.
  4. Characterized by inconstancy; unstable; changeable; fickle; wild; thoughtless; heedless. “Giddy, foolish hours.” --Rowe. “Giddy chance.” --Dryden.
     Young heads are giddy and young hearts are warm.   --Cowper.
  giddy
       adj 1: having or causing a whirling sensation; liable to falling;
              "had a dizzy spell"; "a dizzy pinnacle"; "had a
              headache and felt giddy"; "a giddy precipice";
              "feeling woozy from the blow on his head"; "a
              vertiginous climb up the face of the cliff" [syn: dizzy,
               woozy, vertiginous]
       2: lacking seriousness; given to frivolity; "a dizzy blonde";
          "light-headed teenagers"; "silly giggles" [syn: airheaded,
           dizzy, empty-headed, featherbrained, light-headed,
           lightheaded, silly]
       [also: giddied, giddiest, giddier]