Elinor was half inclined to ask her reason for thinking so, because satisfied that none founded on an impartial consideration of their age, characters, or feelings, could be given;—but her mother must always be carried away by her imagination on any interesting subject, and therefore instead of an inquiry, she passed it off with a smile.
Happy to find that she was not suspected of any extraordinary interest in it; that Mrs. Jennings (as she had of late often hoped might be the case) had ceased to imagine her at all attached to Edward; and happy above all the rest, in the absence of Marianne, she felt very well able to speak of the affair without embarrassment, and to give her judgment, as she believed, with impartiality on the conduct of every one concerned in it.
There are no more uses of "impartial" in the book.
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An impartial judge is necessary for a fair trial.
Some studies require the impartial eye of a scientist.