難題 (nandai) Japanese meaning: difficult problem | KotomoraNo one could solve this difficult math problem.
He always likes to take on challenges.
Usage patterns
〈人〉に難題を突きつけるto confront someone with a difficult demand
The boss confronted his subordinate with an unreasonable demand.
難題を抱えるto be saddled with a difficult problem
The company is saddled with the difficult problem of a lack of funds.
難題に取り組むto tackle a difficult problem
The researchers have been tackling that difficult problem for years.
難題を解決するto solve a difficult problem
He brilliantly solved the difficult problem.
