Unduteous is a rare and often overlooked word, meaning disobedient, disrespectful or lacking in loyalty. Several synonyms exist for unduteous, including rebellious, insubordinate, defiant, disrespectful, wayward, unruly, disobedient, unfaithful, disloyal, and treacherous. These words describe actions or behaviors that show a defiance of authority, lack of respect towards others, or an unwillingness to follow instructions. Whether used to describe a petulant child or an unfaithful partner, the word unduteous conveys the sense of defiance and disrespect that these behaviors exhibit. By using synonyms for unduteous, we can express these negative attributes with precision, and better understand the motivations behind disobedient or rebellious behaviors.