My mom is so ... that I had to explain that I was being sarcastic.


Obtuse or Thick apply in such contexts.

Caveat: Using these words for one's mom would be considered downright rude.


lacking sharpness or quickness of sensibility or intellect : INSENSITIVE, STUPID

He is too obtuse to take a hint.


obtuse, stupid


Perhaps, you should go with imperceptive.

  • 1
    I always thought "unperceptive" was the usual negative, but it seems both "unperceptive" and "imperceptive" are in dictionaries. How ironic. – Stuart F Nov 23 '20 at 10:51
  • Funny that I thought "imperceptive" was the usual negative. BTW, how does this constitute an irony? :) – user405662 Nov 23 '20 at 11:46

maybe guileless - considering the sentence.

guileless: devoid of guile; innocent and without deception.

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