Lacking in intelligence

• dopey

  1. Dazed or lethargic, as if drugged.
  2. Stupid; doltish:
  3. Silly; foolish:

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• dimwitted

  1. Alternative spelling of dim-witted.

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• thick

  1. Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin:
  2. Measuring a specified number of units in this dimension:
  3. Heavy in form, build, or stature; thickset:

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• thick-witted

  1. Stupid; dull.

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• stupid

  1. Slow to learn or understand; obtuse.
  2. Tending to make poor decisions or careless mistakes.
  3. Marked by a lack of intelligence or care; foolish or careless:

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• obtuse

  1. Lacking quickness of perception or intellect.
  2. Characterized by a lack of intelligence or sensitivity:
  3. Not distinctly felt:

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• hebetudinous

  1. Displaying mental lethargy or dullness.

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• dumb

  1. Lacking the power of speech. Used of animals and inanimate objects.
  2. Incapable of using speech; mute. Used of humans.
  3. Temporarily speechless, as with shock or fear:

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• doltish

  1. Like a dolt; dull in intellect; stupid; blockish; as, a doltish clown.

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• dense

  1. Having relatively high density.
  2. Crowded closely together; compact:
  3. Hard to penetrate; thick:

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• blockheaded

  1. Resembling a blockhead; stupid

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