From zakak; clear -- clean, pure.
see HEBREW zakak
H2134. zak
זַךְ adjective pure, clean; absolute זַךְ Job 8:6 5t.; זָךְ֛ Exodus 27:20; Leviticus 24:2; feminine זַכָּה Exodus 30:34 2t.; —
1 literally, pure, i.e. unmixed, free from foreign substances, of olive oil Exodus 27:20; Leviticus 24:2, of frankincense Exodus 30:34; Leviticus 24:7 (all P and H).
2 figurative, pure, clean, righteous (only Job, Proverbs): — of man Job 8:6 ("" יָשָׁר), 33:9 (+ פָ֑שַׁע בְּלִי; "" חַף); as substantive = the pure, righteous מָּעֳלוֺ יָשָׁר וְזַךְ Proverbs 21:8 (opposed to וָזָר֑ q. v.); of mode of life בְּעֵינָיו זַךְ כָּלדַּֿרְכֵיאִֿישׁ 16:2; of mode of action (מָּעֳלוֺ) 20:11 ("" יָשָׁר); of doctrine (לִקְחִי) Job 11:4 ("" הייתי בַּר); of prayer 16:17 ("" בְּכַמָּ֑י חָמָס לֹא).