pinhead

Noun
  1. An ignorant or foolish person (synset 110059116)
    is a type of: simple, simpleton - a person lacking intelligence or common sense
    same as: boob, booby, dope, dumbbell, dummy
  2. The head of a pin (synset 103949196)
    is a type of: head - a projection out from one end
    is a part of: pin - a small slender (often pointed) piece of wood or metal used to support or fasten or attach things

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