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- There are scholars among them, who had spent more years in acquiring abstruse lore, connected with the divine profession, than Mr. Dimmesdale had lived; and who might well, therefore, be more profoundly versed in such solid and valuable attainments than their youthful brother.Chapter 11 — The Interior of a Heart (31% in)
abstruse = difficult to understand
There are no more uses of "abstruse" in The Scarlet Letter.
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