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

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

We are told that Matthew Arnold combined all the characteristics of good conversation—politeness, vivacity, sympathy, interestedness, geniality, a happy choice of words, and a never-failing humor.

From Talks on Talking by Grenville Kleiser

The especial point of excellence which characterizes the work of the Negro teacher is its interestedness.

From Twentieth Century Negro Literature Or, A Cyclopedia of Thought on the Vital Topics Relating to the American Negro by Daniel Wallace Culp

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