Etymology
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dissonant (adj.)

early 15c., dissonaunt, "at variance, disagreeing," from Old French dissonant (13c.) and directly from Latin dissonantem (nominative dissonans), present participle of dissonare "differ in sound," from dis- "apart" (see dis-) + sonare "to sound, make a noise" (from PIE root *swen- "to sound"). The meaning "discordant in sound, harsh" is from 1570s. Related: Dissonantly.

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Definitions of dissonant

dissonant (adj.)
not in accord;
Synonyms: at variance / discrepant
dissonant (adj.)
characterized by musical dissonance; harmonically unresolved;
Synonyms: unresolved
dissonant (adj.)
lacking in harmony;
Synonyms: discordant / disharmonious / inharmonic
From wordnet.princeton.edu