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Adjective: brainless  breyn-lus
  1. Not using intelligence
    "The brainless animal can endure pain, without manifesting even a flinch"
    - headless

See also: stupid, unintelligent

Nearest

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
brainwash