Antonyms of adj off-key

1 sense of off-key

Sense 1
false, off-key, sour -- (inaccurate in pitch; "a false (or sour) note"; "her singing was off key")

INDIRECT (VIA inharmonious) -> harmonious -- (musically pleasing)

Similarity of adj off-key

1 sense of off-key

Sense 1
false, off-key, sour -- (inaccurate in pitch; "a false (or sour) note"; "her singing was off key")
       => inharmonious (vs. harmonious), unharmonious -- (not in harmony)