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erratic

[ɪˈrætɪk]

adj. unpredictable; not even or regular in pattern, movement, or quality

A stock market chart zigzagging wildly up and down

His erratic behavior worried his friends.

"Bipolar" by Katy Perry

Hot N Cold behavior is erratic — unpredictably shifting without warning.

errwander, mistake " " erroneous adj.