There are several synonyms that can be used in place of the phrase "in a little while." Some of these words include shortly, soon, momentarily, presently, and before long. These synonyms all convey the idea that something will happen in the near future without specifying exactly when. They can be used in a variety of contexts, from casual conversations to formal writing. Choosing the right synonym depends on the tone and context of the situation. For example, "shortly" may be more appropriate in a business setting, while "presently" may be better suited for a formal document.