Unknown is a word that describes something or someone that is not known, familiar, or recognized. There are many synonyms for this word that can be used to express the same meaning. Some of the common synonyms for unknown include mysterious, unfamiliar, obscure, uncharted, unexplored, unidentified, nameless, and anonymous. These words convey a sense of something that is hidden or unseen, or a person who is not known by name or identity. Whether you're writing a creative story, a research paper, or a professional report, using synonyms for unknown can help you convey your message more precisely and effectively.