The word "inimaginable" refers to something that is too difficult to imagine or conceive. However, there are a range of synonyms that can be used to convey the same meaning. These include "unimaginable," "unthinkable," "inconceivable," "impossible to comprehend," "beyond imagination," "unfathomable," "indescribable," "unthinkable," and "beyond comprehension." Each of these words expresses the notion that the thing being described is so far outside the realm of ordinary experience that it is impossible to fully grasp or comprehend. Whether you are describing a phenomenon, experience, or idea, these synonyms can be used to powerfully communicate the sense of awe and mystery that surrounds such things.