Unknown
Hidden. Nothing is known about it.
("Even the laws associated with them are righteous if you have not judged them, and their reason is hidden and unknown" – Abarbanel, Deuteronomy 4)
Translation
Expression (Hebrew)
בִּלְתִּי יָדוּעַ
Definition (Hebrew)
נִסְתָּר. לֹא יָדוּעַ עָלָיו דָּבָר.
("שֶׁגַּם הַחֻקִּים הַמְּעֹרָבִים עִמָּהֶם הֵם צַדִּיקִים אִם לֹא שֶׁצִּדְקָתָם וְטַעְמָם נֶעְלָם וּבִלְתִּי יָדוּעַ"- אַבַּרְבַּנְאֵל דְּבָרִים פֶּרֶק ד)