toughie
noun [ C ] informal uk/ˈtʌf.i/ us/ˈtʌf.i/
(DIFFICULT THING)
难题
a difficult question or problem
That last question was a real toughie. 最后的那个问题真难回答。
(PERSON)
old-fashioned informal恶棍；暴徒
a violent person
坚毅不屈的人，意志坚定的人
a strong person who is not easily made weaker or defeated