Toughie (noun)

1. A difficult or challenging task, problem or question.
2. A person who is tough and resilient, especially in the face of adversity.

Origin:

The origin of the word "toughie" is uncertain. it has been used since the 20th century.

Examples:

1. The crossword puzzle was a toughie and it took hours to complete.
2. The math problem was a toughie and it took a lot of effort to solve.
3. He was a toughie because he could handle difficult situations.
4. The exam was a toughie and only a few students passed.
5. He was a toughie because he could take a punch.