different between rhythmical vs arhythmical

English

rhythmical (comparative more rhythmical, superlative most rhythmical)

a- +? rhythmical

arhythmical (comparative more arhythmical, superlative most arhythmical)

Arrhythmic, having no rhythm.
- 2004, Alan Hollinghurst, The Line of Beauty, Bloomsbury, 2005, Chapter 17 (i),
  All the papers came as usual, in their long, arhythmical collapse onto the doormat, where they lay like a menace and were approached at last with long-armed reluctance.

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