knottiest

panelling in knotty pine.

procure a solution to a knotty problem.

She met with a lot of knotty problems.

Even the professor couldn't clarify the knotty point.

The system of the Unconstitutionality Review in our academic research of science of Law is a hot issue in China, which also is a knotty problem.

It has a website, but it still has to unlace the knotty problem facing all weeklies trying to manage themselves into an online future — what does a Web-based weekly look like?