off-key
1. [ adjective ] inaccurate in pitch
Synonyms: sour false
Examples:

"a false (or sour) note" "her singing was off key"

Related terms: inharmonious
2. [ adjective ] inaccurate in pitch
Synonyms: sour false
Examples:

"a false (or sour) note" "her singing was off key"

Related terms: inharmonious
Similar spelling:   off-peak
  off-base