1. [adj]  lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles"
2. [adj]  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"
3. [v]  make dizzy or giddy; "a dizzying pace"

Dizzy
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1. \Diz"zy\ (d[i^]z"z[y^]), a. [Compar. {Dizzier}
   (-z[i^]*[~e]r); superl. {Dizziest}.] [OE. dusi, disi, desi,
   foolish, AS. dysig; akin to LG. d["u]sig dizzy, OD. deuzig,
   duyzig, OHG. tusig foolish, OFries. dusia to be dizzy; LG.
   dusel dizziness, duselig, dusselig, D. duizelig, dizzy, Dan.
   d["o]sig drowsy, slepy, d["o]se to make dull, drowsy, d["o]s
   dullness, drowsiness, and to AS. dw[=ae]s foolish, G. thor
   fool. [root]71. Cf. {Daze}, {Doze}.]
   1. Having in the head a sensation of whirling, with a
      tendency to fall; vertiginous; giddy; hence, confused;
      indistinct.
            Alas! his brain was dizzy.            --Drayton.
   2. Causing, or tending to cause, giddiness or vertigo.
            To climb from the brink of Fleet Ditch by a dizzy
            ladder.                               --Macaulay.
   3. Without distinct thought; unreflecting; thoughtless;
      heedless. ``The dizzy multitude.'' --Milton.
   

2. \Diz"zy\, v. t. [imp. & p. p. {Dizzied}; p. pr. & vb. n.
   {Dizzying}.]
   To make dizzy or giddy; to give the vertigo to; to confuse.
         If the jangling of thy bells had not dizzied thy
         understanding.                           --Sir W.
                                                  Scott.