Knotty (adjective)

Full of knots or characterized by the presence of knots; gnarled or twisted.

Origin:

From the word knot, which means a tight cluster of intertwined threads or a tight ball of something.

Examples:

1. The knotty pine table had a unique character and charm.
2. The knotty wood was difficult to work with.
3. His knotty problem required a lot of thought to solve.
4. The knotty branches of the tree made it difficult to climb.
5. The knotty rope was hard to untangle.