Not your typical Donaldsonism, which tend to be more polysyllabic and classical in etymology.

knag·gy /ˈnægi/

–adjective, -gi·er, -gi·est.
knotty; rough with knots.

[Origin: 1350–1400; ME knag spur, projection, peg (c. G Knagge knot, peg) + -y1]

Source: Dictionary.com.

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