Source : Webster's Revised Unabridged Dictionary (1913)

Blockish \Block"ish\, a.
   Like a block; deficient in understanding; stupid; dull.
   ``Blockish Ajax.'' --Shak. -- {Block"ish*ly}, adv. --
   {Block"ish*ness}, n.

Source : WordNet®

blockish
     adj : resembling a block in shape [syn: {blocky}]