קָדַר

From LSJ

πικρὸν με ἀπαιτεῖς ἐνοίκιον → you ask too much of me, you demand a bitter rent from me

Source

English (Strong)

a primitive root; to be ashy, i.e. dark-colored; by implication, to mourn (in sackcloth or sordid garments): be black(-ish), be (make) dark(-en), X heavily, (cause to) mourn.