But though Rakitin was very sensitive about everything that concerned himself, he was very obtuse as regards the feelings and sensations of others—partly from his youth and inexperience, partly from his intense egoism.
There are no more uses of "obtuse" in the book.
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too obtuse to grasp the implications of his behavior
How can she be so brilliantly incisive on one page and so infuriatingly obtuse on the next?