erratic
US /ɪˈræt̬.ɪk/
UK /ɪˈræt̬.ɪk/

1.
onregelmatig, grillig, wispelturig
not regular or consistent in movement, behavior, or quality
:
•
His breathing was shallow and erratic.
Zijn ademhaling was oppervlakkig en onregelmatig.
•
The car's engine was making erratic noises.
De motor van de auto maakte onregelmatige geluiden.