"Putting in appearance" is a phrase that refers to the act of presenting oneself in a particular way, often with the intention of creating a certain impression. Its antonyms could include words like "withdrawing," "retreating," or "disappearing," which connote a lack of presence or a deliberate avoidance of being seen or noticed. Other possible antonyms might include terms such as "slipping away," "escaping," or "evading," which also suggest the idea of disappearing or avoiding attention. Alternatively, "standing out," "conspicuous," or "assertive" could be considered antonyms, as they suggest a strong, confident presence that commands attention rather than trying to blend in or avoid notice.