Unhistoric is a word that means something that has not been recorded or has no historical significance. Some synonyms for this word could be unhistorical, undocumented, unrecorded, or unknown. These words convey similar meanings to unhistoric, as they all suggest that there is no written or recorded evidence of events or occurrences. Other words that could be used as synonyms for unhistoric include non-historical, forgotten, obscure, or unremembered. The usage of these synonyms is dependent on the context in which they are used, but they all describe something that has not been recorded or lacks historical significance.