erratic

US /ɪˈræt̬.ɪk/
UK /ɪˈræt̬.ɪk/
"erratic" picture
1.

errático, irregular, imprevisível

not regular or consistent in movement, behavior, or quality

:
His breathing was shallow and erratic.
Sua respiração era superficial e errática.
The car's engine was making erratic noises.
O motor do carro estava fazendo ruídos erráticos.