problem

/ˈprɑbləm/
noun
  1. A situation, question, or matter that is difficult to deal with or solve.
    • Traffic is a big problem in many large cities.
    • We need to find a solution to this math problem before the test.
    • She talked to her teacher about the problem she was having with her homework.
  2. A question or exercise designed to test a person's skill or knowledge, especially in mathematics or science.
    • He finished the first problem quickly but got stuck on the second one.
    • Each problem in the puzzle requires careful thinking.
    • The teacher gave us ten algebra problems to solve for homework.
adjective
  1. Causing difficulty or trouble; difficult to manage or control.
    • The problem child in the class often disrupts lessons.
    • The problem knee gives him pain when he runs.
    • We have a problem area in the basement where water leaks in.