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.
Greek > English (Woodhouse Verbs Reversed)
(see also μαραίνω): fade, waste away, be minished
Lexicon Thucydideum
marcescere, to wither, fade, 2.49.6.