ревностно
From LSJ
ὁ Σιμωνίδης τὴν μὲν ζωγραφίαν ποίησιν σιωπῶσαν προσαγορεύει, τὴν δὲ ποίησιν ζωγραφίαν λαλοῦσαν → Simonides relates that a picture is a silent poem, and a poem a speaking picture | Simonides, however, calls painting inarticulate poetry and poetry articulate painting
Russian > Greek
ἀπό σπουδῆς, ἐπιτηδείως, ἐπιτηδέως, ἐξεπίτηδες, ἀραρότως, ἐκτενῶς, ἐκτενέως, ἐν ἐκτενείᾳ, ἐσπευσμένως, ἐκθύμως, προθύμως