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knotty
02
難解
making great mental demands; hard to comprehend or solve or believe
03
こぶだらけの
used of old persons or old trees; covered with knobs or knots
04
複雑な
tangled in knots or snarls
例
The negotiations between the two countries were knotty, with conflicting interests and historical tensions.
The legal case became increasingly knotty as new evidence and conflicting testimonies emerged.
The scientist encountered a knotty problem in the research, requiring innovative approaches to overcome.
Solving the complex mathematical problem proved to be a knotty challenge for even the most skilled mathematicians.
The author skillfully navigated through the knotty plot of the mystery novel, keeping readers engaged until the end.
