In an arhythmic manner; without regular rhythm or in an irregular, erratic way.
Adverbial form derived from 'arhythmic' or 'arhythmical' using the '-ly' suffix, following standard English patterns for creating adverbs from adjectives.
When a doctor says your heart is beating 'arhythmically,' they're giving you a word that sounds almost like a beat itself—there's something poetic about using a word derived from 'rhythm' to describe its absence!
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