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Adjective: defiant  di'fI-unt
  1. Boldly resisting authority or an opposing force
    "a defiant attitude"; "brought up to be aggressive and defiant";
    - noncompliant

See also: difficult, disobedient, incalcitrant [non-standard], insubordinate, intractable, obstreperous, recalcitrant, resistant, resistive, unmanageable, unwilling

Encyclopedia: Defiant