adjective, dizzier, dizziest.
having a sensation of whirling and a tendency to fall; giddy; vertiginous.
bewildered; confused.
causing giddiness or confusion: a dizzy height.
heedless; thoughtless.
Informal. foolish; silly.
verb (used with object), dizzied, dizzying.
to make dizzy.

before 900; Middle English dysy, Old English dysig foolish; cognate with Low German düsig stupefied

dizzily, adverb
dizziness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dizzy (ˈdɪzɪ)
adj , -zier, -ziest
1.  affected with a whirling or reeling sensation; giddy
2.  mentally confused or bewildered
3.  causing or tending to cause vertigo or bewilderment
4.  informal foolish or flighty
vb , -zier, -ziest, -zies, -zying, -zied
5.  (tr) to make dizzy
[Old English dysig silly; related to Old High German tusīg weak, Old Norse dos quiet]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. dysig "foolish, stupid," from P.Gmc. *dusijaz. Meaning "having a whirling sensation" is from mid-14c.; that of "giddy" is from c.1500 and seems to merge the two earlier meanings. Used of the "foolish virgins" in early translations of Matthew xxv; used especially of blondes since 1870s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dizziness diz·zi·ness (dĭz'ē-nĭs)
A disorienting sensation such as faintness, light-headedness, or unsteadiness.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Vertigo is a sensation of motion or spinning that is often described as
People complain of dizziness and difficulty sleeping.
Heat exhaustion is a relatively common reaction to severe heat and can include
  symptoms such as dizziness, headache and fainting.
Air pollution can also cause headaches, dizziness, and nausea.
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