Nonexistent is a word that describes something that doesn't exist or is imaginary. If you're looking for synonyms for this word, you can use any of the following: imaginary, unreal, fictitious, mythical, non-existent, absent, lacking, unfounded, groundless, false, or nonexistent. These words can be used interchangeably when discussing things that don't exist or aren't present. Some other phrases that could be used to suggest the absence of something might include "nowhere to be found" or "vanished into thin air" - both of which convey a sense of loss or disappearance. Whether it's a person, an object, or an idea, using any of these synonyms will help you to more precisely describe what you're talking about when discussing things that don't exist.