There are various synonyms for the word "not swallowed" depending on the context and tone of the sentence. For instance, "unconsumed" or "untaken" could be used in the context of food or medicine. "Rejected" or "refused" may be used to describe the act of deliberately not swallowing something. "Spit out" is a phrasal verb that could be used to describe the physical act of not swallowing, while "choked on" implies an accidental obstruction. "Expelled" could describe something that was thrown out of the mouth, and "ejected" might be used to describe something that was forced out. Overall, there are many ways to describe not swallowing something that can be applied in various situations.