ἐγκαρτερεῖν

From LSJ

Οὔτοι ποθ᾽ οὑχθρός, οὐδ᾽ ὅταν θάνῃ, φίλος → One’s enemy does not become one’s friend when they die

Sophocles, Antigone, 522

Greek > English (Woodhouse Verbs Reversed)

(see also ἐγκαρτερέω): endure, persevere in, persist in

Lexicon Thucydideum

perseverare, perstare, to persevere, persist, 2.61.2.