The word "in-tone" typically refers to having a particular style, mood or attitude. When we think of antonyms for this word, we can think of words that suggest the opposite of having a particular tone. Some antonyms for in-tone could include words like untuned, out-of-tune, discordant, off-key, disharmonious, cacophonous, and jarring. These words convey a sense of dissonance, lack of harmony, and inconsistency that is the polar opposite of having a single in-tone. By using these antonyms, we can contrast different styles, moods, and attitudes, and highlight the importance of finding a consistent tone in all areas of life.