Etymology
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arrhythmic (adj.)

"without rhythm," 1844 (arhythmic), in relation to musical sensibility, Modern Latin, from Greek arrhythmos "irregular, unrhythmical, without measure," from a- "not" (see a- (3)) + rhythmos "measured flow or movement, rhythm; proportion, symmetry" (see rhythm). Related: Arrhythmically.

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Definitions of arrhythmic

arrhythmic (adj.)
lacking a steady rhythm;
an arrhythmic heartbeat
Synonyms: jerking / jerky
arrhythmic (adj.)
without regard for rhythm;
Synonyms: arrhythmical
From wordnet.princeton.edu