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erratic
01
having a strong potential for sudden variations or fluctuations that cannot be predicted
02
likely to perform unpredictably
03
lacking a regular or fixed pattern of behavior or movement
Example
Weather in the region is notoriously erratic, with conditions liable to transform quickly from sunny to stormy with little forewarning.
The performance of the erratic athlete tended to change suddenly from game to game without any consistent factors determining success.
The mad king's erratic decisions caused a lot of trouble.
Sleep schedules became erratic during the stressful weeks leading up to the big exam.
The patient's vital signs showed an erratic fluctuation between highs and lows throughout the night.
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