unknown Synonyms

unidentified unnamed strange obscure unrecognized hidden uncertain undisclosed unspecified undetermined secret unfamiliar mystery unheard-of mysterious unrevealed nameless unsung undecided nonpublic unclear faceless unclaimed xxx untraceable unapparent unsigned unnoticed undefined unknowable unavailable magic number unmarked noncitizen undistinguished kabbalism unacknowledged unnoticeable little-known unverified unresolved top secret unaccounted unnoted unperceived unplumbed unpublished unrecognised unregistered unremarked