erratic

/ɛɹˈætɪk/

/ɪˈɹætɪk/

erratic

having a strong potential for sudden variations or fluctuations that cannot be predicted

synonyms : fickle

likely to perform unpredictably

lacking a regular or fixed pattern of behavior or movement

synonyms : planetary

Examples

1. His erratic behavior and strange beliefs make some people believe he has bats in the belfry, leading to concerns about his mental state.

2. Frost's schooling was erratic.

3. Things are erratic.

4. His vitals became erratic.