problem
/ˈpɹɑbləm/ adjective C2- Of a person or an animal, difficult to train or guide; unruly.
- Causing a problem; problematic; troublesome.
From the library
It’s a vital international problem that you have to solve.
In solving a problem of this sort, the grand thing is to be able to reason backwards.
I left Holmes seated in front of the smouldering fire, and long into the watches of the night I heard the low, melancholy wailings of his violin, and knew that he was still pondering over the strange problem which he had set himself to unravel.
“You’ll find him a knotty problem, though.
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