hotheaded, impulsive, impetuous, madcap, tearaway, brainish -- (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))
impetuous -- (marked by violent force; "impetuous heaving waves")
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