insubordinate

/IH0 N S AH0 B AO1 R D AH0 N EY0 T/
noun
  1. 1

    A person who defies authority.

adjective
  1. 1

    Rebellious or defiant to authority.

  2. 2

    Contumacious.

Source: https://en.wiktionary.org/wiki/insubordinate