sparsedly

In the _Imperial Dictionary_ (avowedly based upon Webster's American work, which I cannot at this moment refer to in its original form), the word in question is given both as an adjective and as a verb, and the derivatives "sparsed," "sparsedly," "sparsely," and "sparseness," are also admitted.

Notes and Queries, Number 16, February 16, 1850 Various

The system of leveeing was too onerous and expensive to be undertaken by the people sparsedly populating the eastern bank throughout the hill-country.

The Memories of Fifty Years Sparks, William H 1870

The hills were darkening on their eastern slopes; the shadows of the few poplars that sparsedly dotted the dusty highway were falling in long black lines that looked like ditches on the dead level of the tawny fields; the shadows of slowly moving cattle were mingling with their own silhouettes, and becoming more and more grotesque.

On the Frontier Bret Harte 1869

The system of leveeing was too onerous and expensive to be undertaken by the people sparsedly populating the eastern bank throughout the hill-country.

The Memories of Fifty Years Containing Brief Biographical Notices of Distinguished Americans, and Anecdotes of Remarkable Men; Interspersed with Scenes and Incidents Occurring during a Long Life of Observation Chiefly Spent in the Southwest William Henry Sparks 1841

Return thither on some clear, dark, moonless night, with a ring of frost in the air, and only a star or two set sparsedly in the vault of heaven; and you will find a sight as stimulating as the hoariest summit of the Alps. The solitude seems perfect; the patient astronomer, flat on his back under the Observatory dome and spying heaven's secrets, is your only neighbour; and yet from all round you there come up the dull hum of the city, the tramp of countless people marching out of time, the rattle of carriages and the continuous keen jingle of the tramway bells.

Edinburgh Picturesque Notes Robert Louis Stevenson 1872