Definition: "Untreacherously" is a phrase that can be used to describe someone who is deliberately dishonest or deceitful, often in order to gain an advantage or manipulate others. It is often associated with a character who is not trustworthy and is known for their manipulative ways. The term "untruly" suggests that the person's actions are not genuine or honest, which can be seen as disrespectful or unprofessional.