From kahah; feeble, obscure -- somewhat dark, darkish, wax dim, heaviness, smoking.
see HEBREW kahah
H3544. keheh
[כֵּהֶה] adjective dim, dull, faint; only feminine כֵּהָה Leviticus 13:6 6t.; plural כֵּהוֺת 13:39; 1 Samuel 3:2; — dim, of eyes 3:2; of burning wick (כ ׳כִּשְׁתָּה) Isaiah 42:3; dull (in colour, of plague-spots) Leviticus 13:6, 21, 26, 39, 56; figurative = faint כ ׳רוּחַ Isaiah 61:3 (opposed to תְהִלָּה מַעֲטֵה).