Bubbleheaded

adj, slang

Definitions

Adjective
  1. 1
    Stupid; vacuous. informal

    "Then at the last minute Harris was brought aboard as Dr. Zachary Smith, initially an authentic, lip-curling nogoodnik who, it was presently discovered, could be better used for laughs played off Mumy and a sober-sided robot (“You bubbleheaded booby,” sneers Harris. “That does not compute,” returns the robot dryly)."

Etymology

From bubble + headed.

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