interestedness

One of the best ways to insure the attainment of a higher plane of mental efficiency is to assume an attitude of interestedness.

From How to Use Your Mind A Psychology of Study: Being a Manual for the Use of Students and Teachers in the Administration of Supervised Study by Harry D. Kitson

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

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

These are attachments that depend on sentiment rather than on interest, and which are as much purer and holier, as virtuous sentiment is purer and holier than worldly interestedness.

From A Residence in France With an Excursion Up the Rhine, and a Second Visit to Switzerland by James Fenimore Cooper