難なん問もん

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Common wordJLPTN1Freq.FrequencyTop 50,000

難問する · noun or participle which takes 'suru'

Meanings

difficult question; difficult problem; perplexity

Refers to a question, problem, or puzzle that is hard to solve or answer. Often used for exam questions, intellectual challenges, or social issues.

〈難なん問もん〉を解とくto solve a difficult problem
彼かれはその難なん問もんを見み事ごとに解といた。
He brilliantly solved the difficult problem.
〈難なん問もん〉に挑ちょうむto tackle a difficult problem
科か学がく者しゃたちはその難なん問もんに挑ちょうんでいる。
The scientists are tackling that difficult problem.
〈難なん問もん〉を抱かかえるto be faced with a difficult problem
国くにはいくつもの難なん問もんを抱かかえている。
The country is facing several difficult problems.
〈難なん問もん〉に取とり組くむto work on a difficult problem
彼かの女じょは長なが年ねんこの難なん問もんに取とり組くんできた。
She has been working on this difficult problem for many years.

難なん題だい
難題 also means a difficult problem, but it often implies a more formal or imposing challenge, such as a thesis topic or a demand, whereas 難問 usually refers to a hard question or intellectual puzzle.
問もん題だいN5
問題 is a general term for question or problem without any inherent difficulty, while 難問 specifically means a question or problem that is hard to solve.
難なん関かんN1
難関 describes a difficult barrier or hurdle one must overcome (e.g. an exam or negotiation), whereas 難問 refers to the hard question or problem itself.
パズル
パズル is typically a playful brain teaser, while 難問 is a serious, difficult problem (academic, practical, etc.) without the game connotation.

Compound of 難 (difficult) and 問 (question/problem). The reading is on'yomi.