There are several synonyms for the word "hallucinational." One of them is "delusional," which refers to a state of mind in which a person holds false beliefs that are not influenced by evidence or reason. "Illusory" is another synonym, which means something that appears real but is not actually there. "Phantasmagorical" is another term that can be used to describe hallucinatory experiences, as it refers to a series of rapidly changing images that are often surreal or bizarre. Other synonyms for "hallucinational" include "fantastical," "fictitious," "pretended," and "imagined." Ultimately, the use of a particular synonym will depend on context and the overall tone of the piece being written.