intentionally
From LSJ
Αὐθαίρετος λύπη 'στὶν ἡ τέκνων σπορά → Procreation is a self-chosen suffering → Spontalis est miseria satio liberûm → Die Kinderzeugung ist ein selbstgewähltes Leid
English > Greek (Woodhouse)
adverb
P. and V. ἑκουσίως, ἐκ προνοίας (Euripides, Hercules Furens 598), P. ἐκ παρασκευῆς, V. ἐξ ἑκουσίας; see deliberately.
Or use adj., P. and V. ἑκών; e. g., kill a person intentionally: P. and V. ἑκὼν ἀποκτείνειν (τινά).