arrhythmic
/ˌær.ɪˈθɪ.mɪk/Definitions
1. adjective
lacking rhythm or regular beat; irregular in rhythm
“The arrhythmic drumming was disrupting the entire orchestra’s performance.”
2. adjective
not having a regular or normal rhythm
“The arrhythmic heartbeat of the patient indicated a serious medical condition.”
3. noun
a lack of rhythm or regular beat
“The arrhythmic in the music was due to a faulty timing device.”