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comparative knaggier, superlative knaggiest
Having many protuberances, knobs or knots; knotty, rough or rugged. examples
(figurative) Temperamentally rough. quotations examples
[…] his lordship was out of humour. That was the way Chollacombe described as knaggy an old gager as ever Charles had had the ill-fortune to serve. Stiff-rumped, that's what he was, always rubbing the rust, or riding grub, like he had been for months past.
1959, Georgette Heyer, chapter 1, in The Unknown Ajax