off-key 
adjective & adverb
1(Of music) not having the correct pitch; out of tune.If the background music was distinctly off-key, so too were far too many aspects of the meal....
- We don't see that playing out of tune or singing off-key is revolutionary.
- Add off-key electronic music, and you begin to have some idea of how annoying this is.
Synonyms
out of tune, flat, tuneless, unmusical, unmelodic, discordant, dissonant, unharmonious
1.1Not in accordance with what is appropriate or correct in the circumstances: [as adjective]: some of the cinematic effects are distractingly off-key...
- The actor's performance is horridly off-key - his screaming antics would be more appropriate for a cartoon villain.
- This bill is off-key, out of tune, and even if the Labour Government flatly denies it, its shrill crescendos of fortissimo make no difference to the fact that it is prescribing State control.
- She croaks, squeaks, howls, and whines her way through the role, nearly always off-key and most horrid.
Synonyms
incongruous, inappropriate, unsuitable, discordant, out of place, out of keeping, jarring, dissonant, inharmonious