P. εἰρηνικῶς.
calmly: P. and V. ἡσυχῆ, ἡσύχως (rare P.), Ar. and V. ἀτρέμα (rare P.); see calmly.
without trouble: P. and V. ἀπραγμόνως (Euripides, Fragment); see painlessly.