Inappropriate behavior can be a difficult phrase to navigate, particularly when attempting to express similar sentiments without using the exact words. Some possible synonyms for inappropriate behavior include misconduct, impropriety, indiscretion, misbehavior, unprofessionalism, misdeed, indiscretion, and wrongdoing. Each of these terms carries a slightly different connotation, but they all broadly refer to behavior that is unacceptable, unbecoming, or improper. Using a variety of synonyms can help one better convey the nature and severity of inappropriate behavior, as well as provide clarity and precision in communication.