prolificness

• "Muttonhead." Mallard, Serjeant Snubbin's Clerk, I have suspected, may have been some Mr. Duck--whom "Boz" had known--in that line A MONUMENTAL PICKWICK The fruitfulness of Pickwick, and amazing prolificness, that is one of its marvels. —  Pickwickian Manners and Customs
• There are men who claim that these are superior to grafted trees, especially in size, prolificness, etc.; that there is something about our wonderful Oregon climate that causes the so-called second generation trees to bear larger and better fruits than the parent plant. —  Walnut Growing in Oregon
• A Frenchman might well hold up his hands in astonished horror at the insane prolificness--the foolhardy fertility--of British householders. —  Nancy
• Nearly all kinds of apples do well, those that are resistant to the attack of woolly aphis are, however, generally chosen in preference, even though they may not be of the highest quality, as their prolificness and freedom from this pest renders them more profitable than varieties of superior quality that are liable to blight, and that are at the same time often somewhat indifferent bearers. —  Fruits of Queensland
• In this damp tropical region where there is ample heat and moisture, plant life comes springing out of the earth with a prolificness which seems inexhaustible. —  The Heart of Nature or, The Quest for Natural Beauty

Roget's II: The New Thesaurus