off key[adjective]Synonyms: irregular, abnormal, anomalous, deviant, divergent, unnatural, unregular
[TahlilGaran] English Synonym Dictionary ▲
ˌoff-ˈkey adjective music that is off-key sounds unpleasant because it is played slightly above or below the correct
pitch ⇒
in tune:
The band sounded slightly off-key.—off-key adverb:
Someone upstairs was singing off-key. [TahlilGaran] Dictionary of Contemporary English ▲