SYNONYMS
stupid, slow, dim-witted, dull-witted, ignorant, unintelligent, imperceptive, half-baked, vacuous, mindless, witless, obtuse, doltish, blockish, lumpish, wooden
stolid, phlegmatic, placid, somnolent, sluggish, torpid, lifeless, inert, inanimate
informal thick, thickheaded, dumb, dense, dim, dopey, slow on the uptake, dead from the neck up, boneheaded, blockheaded, lamebrained, chuckleheaded, dunderheaded, wooden-headed, muttonheaded, pig-ignorant, birdbrained, pea-brained
British informal dozy, divvy, daft, not the full shilling, thick as two short planks
Scottish, Northern English informal glaikit
North American informal chowderhead, dumb-ass
West Indian informal dotish
rare hebete