Adjective arrhythmic has 2 senses
  1. arrhythmic, arrhythmical - without regard for rhythm
    Antonyms: rhythmical, rhythmic (indirect, via unrhythmical)
  2. arrhythmic, jerking, jerky, unsteady - not having a steady rhythm; "an arrhythmic heartbeat"
    Antonym: regular (indirect, via irregular)
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