ἀθυμεῖν

From LSJ

ἀλλὰ διὰ τῆς ἀγάπης δουλεύετε ἀλλήλοις. ὁ γὰρ πᾶς νόμος ἐν ἑνὶ λόγῳ πεπλήρωται, ἐν τῷ Ἀγαπήσεις τὸν πλησίον σου ὡς σεαυτόν → but be enslaved to each other through love; for the whole Torah is fulfilled in one statement: You will love your neighbor as yourself (Galatians 5:13f.)

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἀθυμέω): dejected, despond, be cast down, be dejected, be depressed, be discouraged, be disheartened, be in low spirits, be melancholy, be sad, be sorrowful, lose courage, lose heart

Lexicon Thucydideum

animum despondere, to lose heart, 2.88.3, 6.34.5. 6.80.1. 7.60.5, 7.61.2. 7.76.1. 7.79.3, 8.11.3. 8.76.3. 8.96.2. [Deletum deleted 7.55.1.]
extimescere, to dread greatly, 5.91.1, 7.21.3, [interponitur vulgo commonly inserted τοῦ]