What is another word for tough nut to crack?

Need synonyms for tough nut to crack? Here's a list of similar words from our thesaurus that you can use instead.

Noun
A puzzling situation or problem
Noun
Something or someone puzzling, mysterious or inexplicable
Noun
A difficult or perplexing question or problem
Adjective
Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion
Adjective
Not adaptable in outlook, belief, or response
Noun
Something hard to understand or explain
Noun
Something that is difficult or impossible to understand or explain
Noun
A complicated or baffling situation or thing
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