If in the supposition of his seeking to marry herself, his difficulties from his mother had seemed great, how much greater were they now likely to be, when the object of his engagement was undoubtedly inferior in connections, and probably inferior in fortune to herself.
There are no more uses of "supposition" in the book.
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It is a foolish supposition.
She paints a vivid picture, but we must remember it is all mere supposition.