Unconfirmable is an adjective that describes something that cannot be verified or confirmed by any means. There are several other synonyms for the word unconfirmable which can be used to describe the same conditions. Some of these synonyms include uncertain, doubtful, dubious, questionable, unclear, and unverifiable. These words are commonly used in different contexts to describe situations that cannot be confirmed or authenticated. For example, a piece of information regarding an event may be considered unverifiable until it is confirmed by a reputable source. Overall, the use of synonyms such as these helps to convey the same meaning in different and unique ways.