knotty

knot|ty /n'ɒti/ (knottier knottiest)
1 [ADJ] usu ADJ n
A knotty problem is complicated and difficult to solve.
The new management team faces some knotty problems.
= thorny
2 [ADJ] usu ADJ n
Knotty wood has a lot of small hard areas on it where branches once grew.

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