Had this man been endowed with the slightest capacity for perceiving the feelings of others, and had he at all understood what Pierre’s feelings were, the latter would probably have left him, but the man’s animated obtuseness to everything other than himself disarmed Pierre.
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?