Definitions

from The Century Dictionary.

  • Having a thick or bushy head.
  • Having a thick skull; dull; stupid; doltish.
  • In Crustacea, pachycephalous; of or pertaining to the Pachycephala.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Having a thick skull; stupid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective sluggish and obtuse of mind

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective (used informally) stupid

Etymologies

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