'Brainish' definitions:

Definition of 'brainish'

(from WordNet)
adjective
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(a), brainish]

Definition of 'Brainish'

From: GCIDE
  • Brainish \Brain"ish\, a. Hot-headed; furious. [R.] --Shak. [1913 Webster]