The Collaborative International Dictionary of English v.0.48:
Blockish \Block"ish\, a. Like a block; deficient in understanding; stupid; dull. "Blockish Ajax." --Shak. -- Block"ish*ly, adv. -- Block"ish*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
blockish adj 1: resembling a block in shape [syn: blockish, blocky]