Dumb is an interesting word; while it means unable or unwilling
  to speak, implying a kind of pity especially in the cases of
  animals or babies, it's secondary informal meaning has a whole
  host of fascinating synonyms:

  North American informal
  stupid.
  "a dumb question"
  synonyms: stupid, unintelligent, ignorant, dense, brainless,
  mindless, foolish, slow, dull, simple, empty-headed, stunned,
  vacuous, vapid, idiotic, half-baked, imbecilic, bovine;

  informal thick, dim, moronic, dopey, dozy, thickheaded,
  fat-headed, birdbrained, pea-brained;
  daft
  "he is not as dumb as you'd think"

  antonyms: clever

  I'm guilty of attempting to appear clever so that I am not
  thought of as a mute and all associated meanings that go along
  with it. I'm doing it now! And [1]John Blaise Lent You're not
  incorrect either. You're right. The difference between the way I
  put things and the way yo put things is a matter of taste in how
  we deal with other people. I don't think there is a right or
  wrong in this case and also, there's not really a wrong way to
  view this.

  So in that sense, I was making a MORAL judgement call by calling
  these things "Mistakes". Who am I do declare how someone
  "should" consider other humans? I'm just a guy going blah blah
  blah in the end tongue emoticon

References

  Visible links
  1. https://www.facebook.com/johnlentesq?hc_location=ufi