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• n  a state of wild storminess
• n  a state of agitation or turbulent change or development

• Emotions are so consistently overwrought that tempestuousness is soon diminished to nagging petulance.
• The Japanese Government was rumored to have entered an official protest against the "unwarranted tempestuousness" of the Ambassador.
• Now, apparently, Evgeny has decided her virtuosity on the ice is not enough compensation for her tempestuousness off it.

• agitation
• ferment
• fermentation
• unrest