ἀθυμητέον
From LSJ
ταῦτα δὲ ἔδει ποιῆσαι κἀκεῖνα μὴ ἀφιέναι → these things should have been done without neglecting the others | these are the things you should have done without neglecting the others | these ought ye to have done, and not to leave the other undone
English (LSJ)
A one must lose heart, X.An.3.2.23; οὐκ ἀ. τοῖς παροῦσι πράγμασιν D.4.2.