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archaic impulsive or impetuous
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|Adj.||1.||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)|
incautious - lacking in caution; "an incautious remark"; "incautious talk"