unknown [unknowns]◼◼◼(variable) noun [UK: ˌʌn.ˈnəʊn] [US: ənˈnoʊn]Its origin remains unknown. = Son origine reste inconnue.
stranger [strangers]◼◼◻(person whom one does not know) noun [UK: ˈstreɪn.dʒə(r)] [US: ˈstreɪn.dʒər]I had dinner with a total stranger. = J'ai dîné avec une parfaite inconnue.