disagreeing or harsh in sound; discordant.
out of harmony; incongruous; at variance.
Music. characterized by dissonance.

1400–50; late Middle English dissonaunte (< Anglo-French) < Latin dissonant- (stem of dissonāns, present participle of dissonāre to sound harsh), equivalent to disson- (derivative of dissonus discordant; see dis-1, sound) + -ant- -ant

dissonantly, adverb
undissonant, adjective
undissonantly, adverb

2. incompatible, incongruent, inconsistent.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dissonant (ˈdɪsənənt)
1.  discordant; cacophonous
2.  incongruous or discrepant
3.  music characterized by dissonance
[C15: from Latin dissonāre to be discordant, from dis-1 + sonāre to sound]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 15c., from L. dissonantem (nom. dissonans), prp. of dissonare "differ in sound," from dis- "apart" + sonare "to sound" (see sound (n.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Reading about a dissonant chord doesn't make it sound any sweeter, but repeated
  hearing certainly does.
The dissonant chords and primitive rhythms had a still more unnerving effect
  upon the audience.
Upending such a value set is too cognitively dissonant for many on both sides
  of the equation.
He created a tune that was so dissonant it could not be made into a record.
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