tough nut

NOUN

tough nut to crack

Synonyms

STRONG

enigma mystery perplexity puzzler riddle

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

I am expecting West Ham to play with the kind of intensity that is required but Everton can be a tough nut to crack.

From BBC • Apr. 23, 2026

Getafe, seventh, often prove a tough nut to crack at home and they frustrated their neighbours.

From Barron's • Nov. 23, 2025

"Until they do that, the trade pillar will be a tough nut to crack."

From Reuters • Nov. 17, 2023

There are many other types of oaks to love, and telling them apart can be a tough nut to crack.

From Los Angeles Times • Jun. 1, 2023

She was a tough nut, but she could be so sensible sometimes.

From "Schooled" by Gordon Korman