The antonyms for the word "un-musical" are numerous, and they all describe different aspects of musical ability. Among the most common antonyms are musical, melodic, harmonious, rhythmic, tuneful, melodious, and euphonious. Each of these words has a slightly different meaning, but they all capture the essence of what it means to be musically gifted. To be musical is to have a natural talent for music, to be able to produce melodies that are pleasing to the ear. To be melodic is to have a gift for composing music that is memorable and catchy. To be harmonious is to have a sense of balance and unity in music, while rhythmic implies a strong sense of beat and timing.