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Definition of dunderheaded:

  1. Thick- headed; stupid.

Synonyms:

fatuous, senseless, thick, obtuse, boneheaded, softheaded, oafish, dim, birdbrained, doltish, simple, thickheaded, witless, brainless, lamebrain, unintelligent, dorky, dull, slow-witted, dopey, slow, dim-witted, half-witted, lunkheaded, unsmart, empty-headed, mindless, dumb, chuckleheaded, bonehead, weak-minded, soft, vacuous, gormless, airheaded, brain-dead, pinheaded, bubbleheaded, dense, knuckleheaded, thick-witted, opaque.