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• a  lacking interest in or talent for music
  too unmusical to care for concerts
• a  not musical in nature
  the unmusical cry of the bluejay
• a  lacking melody

• I'm the least musical member of a highly unmusical band.
• New York's Welsh Women's Chorus, in scarlet capes and topper-like hats, proved that a language that looks shy on vowels need not sound unmusical.
• A girl with a rubber range, Marni is a redheaded, blue-eyed lyric soprano who can slip into a contralto and sing in the accents of any unmusical star.

• nonmusical
• unmelodious
• unmelodic

• musical
• melodious