off-key ˌɒfˈkiː ˈɔfˈki
ADJ-GRADED （音乐）走调的，不和谐的，不协调的 When music is off-key, it is not in tune. （音乐）走调的，不和谐的，不协调的
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...wailing, off-key vocals and strangled guitars.
悲戚走调的歌声与哽咽的吉他声
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No, no, no. This won't do. Someone is off-key.
不，不，不，这怎么行，有人唱走调了。
Off-key is also an adverb.