αὐτοπροθύμως
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.)
English (LSJ)
[ῡ], Adv. voluntarily, EM173.8.
Spanish (DGE)
voluntariamente, EM 173.8G.
Greek (Liddell-Scott)
αὐτοπροθύμως: ἐπίρρ. ἐξ οἰκείας προθυμίας, λίαν προθύμως, Ἐτυμ. Μ. 173. 8.