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Adjective: brainish  brey-nish
Usage: archaic
  1. Characterized by undue haste and lack of thought or deliberation
    - hotheaded, impulsive, impetuous, madcap, tearaway

See also: incautious

Nearest

brain trust
brain truster
brain tumor
brain tumour
brain wave
brainbox
braincase
brainchild
brain-fag
brainiac
brainish
brainless
brainpan
brainpower
brains trust
brainsick
brainstem
brain-stem
brainstorm
brainstorming
brain-teaser