Untunable is a word that refers to something that cannot be tuned or made melodious. As such, it only has a few synonyms that relate to the same idea of being inharmonious or discordant. Some of the synonyms for untunable include cacophonous, discordant, dissonant, harsh, and jarring. These words are often used to describe music, sounds, or voices that are unpleasant to hear. Other possible alternatives to untunable include unmusical, unmelodious, off-key, tone-deaf, or out of tune. By using different synonyms for untunable, you can add nuance and variety to your writing or speech and avoid repetition.