難題

Meaning

1. n
   difficult problem; challenge

Example sentences

• 君はそれらの難題に対処しなくてはならない。

  You have to cope with those difficult problems.

• 一難去ってまた一難、またまた難題が社長からトップダウンで降りてきたよ。

  No sooner had we finished working on one tough problem than the president sent us yet another straight from the top.

• それは難題だ。

  That's a tall order.