unknown in Polish
unknown in Polish
nieznany
(sometimes, _, postpositive) Not known; unidentified; not well known.
nieznajomy
(sometimes, _, postpositive) Not known; unidentified; not well known.
niewiadomy
(sometimes, _, postpositive) Not known; unidentified; not well known.
niewiadoma
(algebra) A variable (usually x, y or z) whose value is to be found.