interestedness

I thank you my dear Aunt for your kind Epistles of April 9th & Nov'r 10th, the kind interestedness you yet continue to take in my concerns merits the warmest returns of Gratitude.

From Diary of Anna Green Winslow A Boston School Girl of 1771 by Anna Green Winslow

Now that Roxalanne came to entreat him to do that which already he saw himself forced to do, he turned his attention to the profit that he might derive from her interestedness on my behalf.

From Bardelys the Magnificent; being an account of the strange wooing pursued by the Sieur Marcel de Saint-Pol, marquis of Bardelys... by Rafael Sabatini

"Take into account the skill of forgers and the interestedness of apologists and calumniators."

From Bouvard and Pécuchet A Tragi-comic Novel of Bourgeois Life by Gustave Flaubert

I might give them what degree of credit I pleased; and take them with abatement for Mr. Solmes's interestedness, if I thought fit.

From Clarissa Harlowe; or the history of a young lady — Volume 2 by Samuel Richardson

However, through all the rigid discipline the little girl retained her natural buoyancy of childhood, the spontaneous interestedness, the cheerfulness and animation, which were a part of her goodly heritage.

From Patchwork A Story of 'The Plain People' by Helen Mason Groce