From WordNet (r) 2.0 (August 2003) [wn]:
dizzy
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:
giddy, woozy, vertiginous]
2: lacking seriousness; given to frivolity; "a dizzy blonde";
"light-headed teenagers"; "silly giggles" [syn:
airheaded, empty-headed, featherbrained, giddy,
light-headed, lightheaded, silly]
v : make dizzy or giddy; "a dizzying pace"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dizzy \Diz"zy\ (d[i^]z"z[y^]), a. [Compar. Dizzier
(d[i^]z"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.
[1913 Webster]
Alas! his brain was dizzy. --Drayton.
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2. Causing, or tending to cause, giddiness or vertigo.
[1913 Webster]
To climb from the brink of Fleet Ditch by a dizzy
ladder. --Macaulay.
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3. Without distinct thought; unreflecting; thoughtless;
heedless. "The dizzy multitude." --Milton.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dizzy \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.
[1913 Webster]
If the jangling of thy bells had not dizzied thy
understanding. --Sir W.
Scott.