The antonyms for the phrase "conducting oneself" are a bit broad, as they can cover a wide range of behaviors. Some potential antonyms could include acting impulsively, being reckless, or behaving erratically. Other antonyms might include acting irresponsibly, indulging in bad habits or vices, or disregarding social norms or expectations. Overall, the antonyms for "conducting oneself" all suggest a lack of discipline, self-control, or consideration for others, and instead imply a tendency to act without thought, foresight, or concern for consequences. It's important to keep in mind, however, that different contexts may call for different standards of conduct, and what qualifies as "good" or "bad" behavior can depend on a variety of factors.