UNKNOWN Synonyms: 102 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/unknown
WEBSynonyms for UNKNOWN: unfamiliar, unbeknown, unbeknownst, unrecognized, unsuspected, unaware, unperceived, unmindful; Antonyms of UNKNOWN: familiar, old, hackneyed, tired, traditional, conventional, established, tried.
DA: 12 PA: 81 MOZ Rank: 43