numbskulls

/N AH1 M S K AH1 L Z/
noun
  1. 1

    A dunce, mentally dull or stupid person.

  2. 2

    A person who refuses to learn or grow mentally.

    โ€œThat numskull will never learn how to compose a letter.โ€

  3. 3

    A traditional name for a fool who serves as the butt of jokes about stupidity.

Source: https://en.wiktionary.org/wiki/numbskull, https://en.wiktionary.org/wiki/numbskulls, https://en.wiktionary.org/wiki/numskull