Source : WordNet®

nonmusical
     adj 1: lacking interest in or talent for music; "too unmusical to
            care for concerts"; "it is unfortunate that her
            children were all nonmusical" [syn: {unmusical}] [ant:
             {musical}]
     2: not musical in nature; "the unmusical cry of the bluejay"
        [syn: {unmusical}, {dissonant}] [ant: {musical}]