Chapter 14 The Hound of the Baskervilles One of Sherlock Holmes’s defects—if, indeed, one may call it a defect—was that he was exceedingly loath to communicate his full plans to any other person until the instant of their fulfilment.
There are no more uses of "loath" in the book.
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loath to admit a mistake
Much as they loath to admit it, there are serious divides splitting the party.