2 adverbs to describe how to fertileness

"Fertileness, fruitfulness; Fertily, fruitfully, abundantly.

And, after commending this work of Johnson's, as A STANDARD, from which, "it is earnestly to be hoped, that no author will henceforth, on light grounds, be tempted to innovate," he adds, "This Dictionary, however, contains some orthographical inconsistencies which ought to be rectified: such as, immovable, moveable; chastely, chastness; fertileness, fertily; sliness, slyly; fearlessly, fearlesness; needlessness, needlesly.

2 adverbs to describe how to  fertileness  - Adverbs for  fertileness