1. (n.) The quality or state of being knotty or full of knots.

2. (n.) Difficulty of solution; intricacy; complication.

abstruseness arduousness bothersomeness burdensomeness complication convolution crabbedness crampedness deepness difficultness difficulty esoterica hairiness hardness inscrutability intricacy involvement knottiness laboriousness onerousness oppressiveness profoundness profundity reconditeness rigor rigorousness ruggedness strenuousness toilsomeness toughness troublesomeness