μαραίνεσθαι

From LSJ

τοῖς πράγμασιν γὰρ οὐχὶ θυμοῦσθαι χρεών· μέλει γὰρ αὐτοῖς οὐδέν· ἀλλ' οὑντυγχάνων τὰ πράγματ' ὀρθῶς ἂν τιθῇ, πράξει καλῶς → It does no good to rage at circumstance; events will take their course with no regard for us. But he who makes the best of those events he lights upon will not fare ill.

Source

Greek > English (Woodhouse Verbs Reversed)

(see also μαραίνω): fade, waste away, be minished

Lexicon Thucydideum

marcescere, to wither, fade, 2.49.6.