Added 9 October 2026 arrhythmic adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about arrhythmic at Wordnik → Where our words come from → Lacking a steady rhythm. an arrhythmic heartbeat Without regard for rhythm. Related Words: unrhythmicunrhythmicalirregularunsteadyjerkyjerkingarrhythmicalarhythmicirrhythmicarhythmicalnonrhythmicextrarhythmic Back to today's word