Tough nut to crack and Thick-skinned

Thick-skinned and tough nut to crack are semantically related. in pigheaded topic. In some cases you can use "Thick-skinned" instead an adjective phrase "Tough nut to crack".

Thick-skinned adjective - Having or showing a lack of sympathy or tender feelings.

Tough nut to crack and thick-skinned are semantically related. Sometimes you can use "Tough nut to crack" instead an adjective phrase "Thick-skinned".