unrhythmicadj.

1826 Q. Theol. Rev. Sept. 401 The early Christians were the corrupters of a good Greek music, by depriving it of its metre and rhythm for the purpose of adapting it to their own prose compositions or unrhythmic Hebrew poetry.

1884 Athenæum 2 Aug. 142/2 No unrhythmic verse was ever yet remembered beyond the generation that produced it.

1926 Times 28 May 12/2 One could only feel sorry for the amateur dancers..who had to form their steps to such loose and unrhythmic playing.

1976 J. Godbolt All this & 10% iv. 45 Their movements on the floor were, without exception, wild, totally unrhythmic and it was physically dangerous to be in proximity when they were in full thrash.

2003 Daily Tel. 29 Sept. i. 19/3 It was certainly tough going—fractured, unharmonic, unrhythmic, elliptical, chilly, weird.