toughie
/ˈtʌfɪ/noun
informal <非正式>
1
- a person who is tough, determined, and not easily daunted粗暴的人, 霸道的人。
2
- a difficult problem or question棘手的问题, 难题：
Who do you admire most? That's a toughie.
你最钦佩的人是谁？这可是个难题。