Antonyms for the phrase "conducts properly" include phrases such as "behaves irresponsibly," "displays inappropriate conduct," or "acts unprofessionally." These phrases suggest a lack of proper behavior or adherence to expected norms. Other antonyms could include "disobeys rules," "disregards protocol," or "exhibits improper etiquette." Essentially, any phrase that suggests improper or unsuitable behavior would be an antonym to "conducts properly." It is important to note that proper conduct can be subjective and can vary depending on the context or situation, but it generally implies behaving in a way that is respectful, responsible, and in line with acceptable social norms.