прочно

From LSJ

τὸ μὲν εὖ πράσσειν ἀκόρεστον ἔφυ πᾶσι βροτοῖσιν → all mortals have by nature an insatiable appetite for success, our mortal state with bliss is never satiate, success is something for which humanity is insatiatable

Source

Russian > Greek

συγκόλλως, στερεῶς, πύκα, εὐκρατῶς, καταπαγίως, βεβαίως