The crossword solutions for the term COMPLICATED PROBLEM are KNOT. A KNOT is a type of fastening formed by looping and tying a rope, string, or cord around itself or another object. Knots have been used for centuries to secure items, such as boats, and to tie clothing and other objects together. Knots can also be used to create decorative patterns and designs. In the context of a complicated problem, a KNOT can represent the complexity of the issue, as it is often difficult to untangle and solve.