smoothly
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
calmly: P. and V. ἡσυχῆ, ἡσύχως.
easily: P. and V. ῥᾳδίως, εὐπετῶς; see easily.
gently: P. and V. ἠπίως, P. πράως, Ar. and P. μαλακῶς, Ar. and V. μαλθακῶς.
