Noah Webster's Dictionary (a.) Boldly resisting; insolent; as, a defiant spirit or act.

Multi-Version Concordance Defiant (2 Occurrences) 1 Thessalonians 4:8 Therefore a defiant spirit in such a case provokes not man but God, who puts His Holy Spirit into your hearts. (WEY) Proverbs 7:11 She is loud and defiant. Her feet don't stay in her house. (WEB NIV)