knotty
adj. 难以解决的，棘手的；（木头表面）多节（疤）的
比较级 knottier
最高级 knottiest
例句
The new management faces some knotty problems.
新的管理层面临着一些棘手的问题。
《柯林斯英汉双解大词典》
It was a knotty question.
这是一个棘手的问题。
Einstein would furiously play his violin as a way to think through a knotty physics problem.
爱因斯坦会以疯狂地拉小提琴的方式来思考一个复杂的物理问题。
