The word "more nonrealistic" can be replaced with a variety of synonyms to convey the same meaning. Some options include "fantastical," "unbelievable," "impossible," "unreal," "surreal," "far-fetched," "implausible," or "unimaginable." These words suggest that the concept or idea being described is beyond the bounds of reality or reason. Depending on the context and tone of the writing, different synonyms may be more appropriate. However, all of these options convey a sense of something that is not grounded in reality and may require some amount of suspension of disbelief to accept.