ἐγκαρτερεῖν
From LSJ
Οὔτοι ποθ᾽ οὑχθρός, οὐδ᾽ ὅταν θάνῃ, φίλος → One’s enemy does not become one’s friend when they die
Greek > English (Woodhouse Verbs Reversed)
(see also ἐγκαρτερέω): endure, persevere in, persist in
Lexicon Thucydideum
perseverare, perstare, to persevere, persist, 2.61.2.