- not on the right note; flat or sharp
- not quite in accord with what is normal, fitting, etc.
- Music Pitched higher or lower than the correct notes of a melody.
- Being out of accord with what is considered normal or appropriate: a high-flown, off-key speech by a newcomer.
(comparative more off-key, superlative most off-key)
- key off
(comparative more offkey, superlative most offkey)
- in an off-key manner