From ka'ab; suffering (physical or mental), adversity -- grief, pain, sorrow.
see HEBREW ka'ab
H3511. keeb
כְּאֵב noun masculineJob 2:13 pain; — ׳כ absolute 2:13; Isaiah 17:11; construct 65:14; suffix כְּאֵבִי Job 16:6 2t.; — pain, mental and physical 2:13; 16:6 perhaps also Psalm 39:3; ׳כּ אָנוּשׁ (in disappointment and disaster) Isaiah 17:11 ("" נַחֲלָה from חָלָה); mental, לֵֿב׳כּ 65:14 ("" רוּחַ שֵׁבֶר) so Jeremiah 15:18 ("" מַכָּה figurative)