מָר

From LSJ

ἀπὸ τῶν ὀφθαλμῶν ὑδρορρόαι δύο ῥέουσιν μέλανος → two streams of black run from the eyes

Source

English (Strong)

or (feminine) marah; from מָרַר; bitter (literally or figuratively); also (as noun) bitterness, or (adverbially) bitterly: + angry, bitter(-ly, -ness), chafed, discontented, X great, heavy.