unrhythmical

from WordNet (r) 3.0 (2006)

unrhythmical
    adj 1: not rhythmic; irregular in beat or accent [syn:
           {unrhythmical}, {unrhythmic}] [ant: {rhythmic},
           {rhythmical}]

from Moby Thesaurus II by Grady Ward, 1.0

53 Moby Thesaurus words for "unrhythmical":
      broken, capricious, careening, catchy, choppy, desultory,
      deviative, disconnected, discontinuous, eccentric, erratic, fitful,
      flickering, fluctuating, guttering, halting, herky-jerky,
      heteroclite, immethodical, inconstant, intermittent, intermitting,
      irregular, jerky, lurching, nonuniform, patchy, rambling, rough,
      scrappy, snatchy, spasmatic, spasmic, spasmodic, spastic, sporadic,
      spotty, staggering, uncertain, unequal, uneven, unmethodical,
      unmetrical, unregular, unsettled, unsteady, unsystematic, variable,
      veering, wandering, wavering, wobbling, wobbly