a tough nut


Also found in: Dictionary, Thesaurus, Medical, Financial, Encyclopedia.
Related to a tough nut: tough nut to crack

a tough nut (to crack)

A person, thing, situation, or problem that is particularly difficult to understand, solve, or deal with. I've been dating Jenny for over a year, and I still think she's a tough nut to crack! Figuring out the best way to modernize our product without alienating existing customers is definitely a tough nut to crack.
See also: nut, tough

a tough nut

or

a hard nut

INFORMAL
If you call someone a tough nut or a hard nut, you mean they have a strong character and are very determined. That Bridget would sort anyone out — she's a tough nut.
See also: nut, tough