a tough nut

a tough nut (to crack)

also a hard nut (to crack)

a difficult problem to solve Unemployment is a tough nut. Overcoming local trade barriers is going to be a hard nut to crack.

Name	Pronounced	Usage
Jaquelyn	JAK-ə-lin	English (Rare)
Nels	-	Danish
Bion	-	Ancient Greek
Kelly	KEL-ee	Irish, English
Katlego	-	Southern African, Tswana
Alban	['ɔ:lbən]