Somewhat like a block; tending toward being blocky, solid, or showing signs of dullness or stubbornness.
From 'block' plus '-ish' suffix, which can denote resemblance to or slight qualities of something. Used for both physical shape and personality traits.
Using '-ish' for both shapes and personalities shows how flexible English is—something can be 'blockish' because it looks chunky OR because someone acting blockish is being stubborn.
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