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out of character – phrase not in keeping with someone's usual pattern of behavior : character – n. the way someone thinks, feels, and behaves : someone's personality
uncertain – adj. not sure : having some doubt about something
fickle – adj. changing often : changing opinions often
annoying – adj. causing slight anger
volatile – adj. characterized by or subject to rapid or unexpected change
mounting – n. something on which something else is or can be attached
temper – n. heat of mind or emotion : proneness to anger
