αὐτοπροθύμως
From LSJ
τὸ δ' ἡδέως ζῆν καὶ ἱλαρῶς οὐκ ἔξωθέν ἐστιν, ἀλλὰ τοὐναντίον ὁ ἄνθρωπος τοῖς περὶ αὑτὸν πράγμασιν ἡδονὴν καὶ χάριν ὥσπερ ἐκ πηγῆς τοῦ ἤθους προστίθησιν → but a pleasant and happy life comes not from external things, but, on the contrary, man draws on his own character as a source from which to add the element of pleasure and joy to the things which surround him
English (LSJ)
[ῡ], Adv.
A voluntarily, EM173.8.
Greek (Liddell-Scott)
αὐτοπροθύμως: ἐπίρρ. ἐξ οἰκείας προθυμίας, λίαν προθύμως, Ἐτυμ. Μ. 173. 8.
Spanish (DGE)
voluntariamente, EM 173.8G.