Lacking regular rhythm; displaying irregular or abnormal patterns of timing or pulse.
Greek 'a-' + 'rhythmos' (rhythm) + '-ical' (adjective suffix variant). This extended form of 'arrhythmic' adds the '-ical' suffix common in English for forming adjectives, particularly in scientific contexts.
The ocean's waves appear arrhythmical to our ears, but meteorologists can actually predict wave patterns using complex mathematics—what sounds random often has hidden order underneath.
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