ἀνελεημόνως

From LSJ

ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers

Source

French (Bailly abrégé)

adv.
sans pitié.
Étymologie: ἀνελεήμων.

Spanish

despiadadamente