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knotty (adj) (of a problem, situation, etc.)difficult to solve; having hard and twisted parts.
A knotty problem is difficult to solve. A knotty situation is a complicated situation causing a lot of difficulty. The Iraq issue has become a knotty problem for the US. That is, the situation in Iraq is making it difficult for the US to decide whether to continue its control of the Iraqi affairs or to withdraw. Knotty wood is wood containing hard round parts. The roots of most of the trees are knotty in that they are all hard and twisted.
- What appears a knotty problem to the majority of ordinary human beings appears very simple to geniuses who resolve them in no time.
- Some of the knotty problems connected with the nature of the universe have been solved very easily by geniuses like Galileo, Newton, Darwin, Einstein, etc.