erratic
🇺🇸
/ɪˈrætɪk/
🇬🇧
/ɪˈrætɪk/
acting, moving, or changing in ways that are not expected or usual
The car's speed was erratic, making it hard to follow.
車の速度が不規則で、追いかけるのが難しかった。
a big rock that's different from surrounding rocks, left behind by melting ice
The field was scattered with erratics left behind from the last Ice Age.
その野原は、最後の氷河期から残された変動石で散らばっていた。