difficult or complex problem
something hard or complicated to solve
a puzzle that is problematic or defies solution
The accountant always found the end of the tax year to be a knotty problem.
Translating from another language can be a knotty problem for some students.
It is always a knotty problem to understand my boss’s handwriting.
The new Government is faced with a knotty problem to kick start the economy.
Evolution is a knotty problem if you believe in God.
When you are staring out the window and letting your mind go blank, that can actually be when you solve a knotty problem.
She was part of a team that tackled the knotty problem.
Don’t worry! There would be a solution to this knotty problem.
Child care is another knotty problem for working couples.
There are solutions to this discrete, clearly identifiable but knotty problem.
Colleagues from all sides wanted the tangles teased out in this knotty problem.
Untangling environmental factors from social and health factors is a knotty problem.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.