The term "off tone" refers to something that is not quite right or in alignment with a particular standard, such as a tune or voice that sounds unpleasant or out of tune. Some antonyms for "off tone" include "in tune," "harmonious," "pleasing," "melodic," and "pitch-perfect." These words suggest musical or vocal performances that are polished, well-rehearsed, and professionally executed. Alternatively, opposite words for "off-tone" can also include descriptions such as "irregular," "discordant," "unpleasant," "dissonant," or "sour," which all refer to a musical or vocal performance that is unpleasant or not in keeping with traditional musicality. In the end, the antonyms for "off tone" depend on the context in which the phrase is used.