כָּסַף kâçaph (H3700)

properly, to become pale, i.e. (by implication) to pine after; also to fear

1) to long for, yearn for, long after 1a) (Qal) to long for 1b) (Niphal) 1b1) to long for (deeply) 1b2) being longed for (participle)

a primitive root;