tearaway(a)

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WordNet Dictionary
	Definition:		[adj]  characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
	Synonyms:		brainish, hotheaded, impetuous, impulsive, incautious, madcap