erratic

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

不稳定的, 不规则的, 古怪的

not regular or consistent in movement, behavior, or quality

:
His breathing was shallow and erratic.
他的呼吸浅而不规律
The car's engine was making erratic noises.
汽车发动机发出不规律的噪音。