Defiant (adjective)

1. Showing defiance; challenging authority.
2. Characterized by bold or disobedient resistance.

Origin:

Origin: middle english: from old french, present participle of defier (see defy).

Examples:

1. The protestors were defiant in the face of police brutality.
2. Despite being reprimanded, the child remained defiant and refused to apologize.
3. She took a defiant stance against the company's unethical practices.