problem (EN)

noun, adjective

noun “problem”

1. something that needs to be solved or dealt with
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   Solving the math problem took her the entire afternoon.
2. a question that needs an answer, often used in education
   For homework, the teacher assigned ten math problems to practice our multiplication skills.
3. (with a possessive determiner) unwillingness to accept something
   If he can't see your point of view, that's his problem, not yours.

adjective “problem”

1. (of a person or animal) hard to manage or control
   The problem horse refused to follow any of the trainer's commands.