When it comes to expressing indecision or uncertainty, there are several synonyms for the phrase "am undecided" that can be used interchangeably. Some of these synonyms include "unsure," "hesitant," "undecided," "uncertain," "doubtful," "wavering," "indecisive," "vacillating," and "ambivalent." Each of these words conveys a sense of uncertainty or inability to make a concrete decision, but may have slightly different connotations depending on the context. Ultimately, whichever synonym is chosen should accurately reflect the speaker's level of indecision or wavering, and help to clarify their stance on a given topic.