ἐπιπόνως

From LSJ

ἐν πιθήκοις ὄντα δεῖ εἶναι πίθηκον → in Rome we do as the Romans do | when in Rome, do as the Romans do | when in Rome, do as the Romans | when in Rome, do like the Romans do | when in Rome | being among monkeys one has to be a monkey

Source

English (Woodhouse)

(see also: ἐπίπονος) wearily, with difficulty, with great exertion

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French (Bailly abrégé)

adv.
avec peine, laborieusement;
Cp. ἐπιπονώτερον, Sp. ἐπιπονώτατα.
Étymologie: ἐπίπονος.

Russian (Dvoretsky)

ἐπιπόνως: трудно, с трудом (εὑρίσκειν Thuc.; ζῆν Xen., Arst., Plut.): ἐ. διανυκτερεῦσαι Plut. провести тяжелую ночь.

Lexicon Thucydideum

aegre, cum labore, with difficulty, labor, 1.22.3.