60 synonyms for unknown such as dark, anonymous, and concealed. Unknown is an adjective, and its antonyms are known, decided, familiar, famous, and celebrated.
Anonymous, concealed, dark, exotic, forgotten, hidden, in limbo, in the balance, incognito, inconclusive, inconsequential, indefinite, innominate, insignificant, little known, lowly, minor, mysterious, nameless, new, novel, obscure, outlandish, pending, remote, secret, strange, unascertained, uncharted, undecided, undefined, undesignated, undetermined, undisclosed, undiscovered, undistinguished, undivulged, unestablished, unexplored, unfamiliar, unfixed, unheard of, unhonoured, unidentified, unimportant, unmapped, unnamed, unprecedented, unrenowned, unresolved, unrevealed, unsettled, unspecified, unsung, unsure, untold, untravelled, up in the air, and virgin.