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) Synonym(s):hotheaded, impulsive, impetuous, madcap, tearaway(a), brainish
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Brainish \Brain"ish\, a.
Hot-headed; furious. [R.] --Shak.
Dictionary De - En
De - Es
De - Pt