arrhythmic
Concise Oxford English Dictionary © 2008 Oxford University Press:
arrhythmic /əˈrɪðmɪk/ (also arhythmic)
▶adjective not rhythmic.
■ relating to or having cardiac arrhythmia.
– derivatives
arrhythmical adjective,
arrhythmically adverb.
arrhythmical adjective,
arrhythmically adverb.
'arrhythmic' also found in these Oxford entries:

