1. full of knots; having many knots
2. difficult to solve or understand; complicated

Examples

• The old oak tree had a knotty trunk covered in bumps.
• She worked with knotty pine wood for the cabin walls.
• The math problem was particularly knotty and took hours to solve.
• The committee faced a knotty issue about budget allocation.
• His knotty hair was difficult to comb after swimming.
• The detective encountered a knotty case with few clues.
• The knotty rope was hard to untangle.