asleep, beef-witted, benumbed, blear-witted, blockish, blunt-witted, blunt, callous, dead, deadened, dense, dim-witted, dim, doltish, dopey, dull-headed, dull-pated, dull-witted, dull, dull of mind, dumb, fat-witted, gross-headed, heavy, hebetudinous, impassible, imperceptive, impercipient, insensate, insensible, insensitive, insentient, numb, numbed, obdurate, obtuse, slow-witted, slow, sluggish, thick-brained, thick-headed, thick-pated, thick-skinned, thick, thickheaded, thickskulled, unfeeling, unfelt, unperceptive, wooden