The term "fake up" can have negative connotations, as it refers to the act of putting on a false appearance or pretending to be someone you are not. To avoid using this term, there are several synonyms that can be used to convey a similar meaning without the negative connotations. Some examples include "pretend," "fabricated," "artificial," "imitation," and "counterfeit." These words can be used to describe anything that is not genuine or authentic, from a fake smile to a fake leather jacket. By using more neutral language, writers and speakers can avoid implicating negative judgments about people or things that may not be genuine.