What is another word for tough nut?
Pronunciation: [tˈʌf nˈʌt] (IPA) 
The phrase "tough nut" is often used to describe someone who is difficult to deal with or understand. There are many synonyms for this phrase, including "hard nut to crack," "difficult person," "challenging individual," "stubborn type," "unyielding personality," "resilient character," "tough cookie," "hard-boiled egg," "uncompromising contender," "tenacious opponent," and "steel-willed adversary." All of these words convey a similar message - that the person in question is not easy to deal with. However, they also imply a sense of strength and determination. Those who are described as "tough nuts" are often seen as formidable opponents, but also as people who will not give up easily.
