כָּאַב

From LSJ

ἀλλὰ τῷ ὕψει τῶν θείων ἐντολῶν σου → but by the sublimity of thy divine commandments

Source

English (Strong)

a primitive root; properly, to feel pain; by implication, to grieve; figuratively, to spoil: grieving, mar, have pain, make sad (sore), (be) sorrowful.