10
sour(adjective, hard, right, severe, sharp)
9
harsh(adjective, hard, severe, sharp, flat)
6
discordant(adjective, hard, right, severe, sharp)
6
false
5
divergent(adjective, right, wrong, irregular, improper)
5
flat(adjective, hard, right, severe, sharp)
5
irregular(adjective, right, wrong, improper, different)
4
abnormal(adjective, right, wrong, irregular, improper)
4
anomalous(adjective, right, wrong, irregular, improper)
4
atonal
4
deviant(adjective, right, wrong, improper, different)
4
dissonant(adjective, hard, right, severe, sharp)
4
inharmonious(adjective, right)
4
unmusical(adjective, hard, right, severe, sharp)
4
unnatural(adjective, right, wrong, improper, different)
3
out of tune(expression, adjective, idiom, right)
3
unharmonious
2
cacophonous(adjective, hard, severe, sharp, flat)
2
cracked(adjective, hard, severe, sharp, flat)
2
different(adjective, wrong, irregular, improper, conflicting)
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APASmart Define. (2015). off-key thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/off-key/thesaurus/synonyms
ChicagoSmart Define. 2015. "off-key thesaurus" https://smartdefine.org/off-key/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, off-key thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/off-key/thesaurus/synonyms>.
MLASmart Define. "off-key thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/off-key/thesaurus/synonyms>