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) • Syn: hotheaded, impulsive, impetuous, madcap, tearaway • Similar to: incautious • Derivationally related forms: impetuousness (for: impetuous), impetuosity (for: impetuous), impulsiveness (for: impulsive) • Usage Domain: archaism, archaicism
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