What is another word for tough nut to crack?

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Noun A puzzling situation or problem puzzler challenge mystery abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber inscrutability mystification occult oracle perplexity poser problem puzzle puzzlement question rebus riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why brainteaser braintwister closed book inscrutableness mindboggler sixty-four-thousand-dollar question Noun Something or someone puzzling, mysterious or inexplicable paradox head-scratcher quandary secret bewilderment brain-teaser knot mind-boggler mind-twister parable sticker question mark unsolved problem Gordian knot a closed book sixty-four dollar question Noun A difficult or perplexing question or problem dilemma facer toughie awkward problem cruncher difficult question knotty problem vexed question tough one hard nut to crack Adjective Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion obdurate obstinate stubborn implacable inflexible adamant unbending unrelenting unyielding firm immovable intransigent mulish relentless stiff-necked wilful determined dogged fixed headstrong inexorable intractable iron pig-headed hard persistent uncompromising unshakeable bull-headed tenacious indurate pertinacious steadfast strong-minded unmalleable unpersuadable adamantine bloody-minded bullheaded contumacious hardened hardheaded hard-nosed inconvincible iron-willed opinionated ossified pat perverse pigheaded refractory self-opinionated self-willed stony willful unimpressible bullhead hardhearted harsh impertinent mean recalcitrant rigid tough uncompassionate uncooperative unemotional unrepentant unshakable cold fish hanging tough proof against persuasion set in stone Adjective Not adaptable in outlook, belief, or response strict rigorous stern severe stringent austere authoritarian brassbound cast-iron exact exacting flinty hard-line heavy-handed ramrod resolute set unswerving unwavering invariable unadaptable unalterable undeviating changeless chiselledUK chiseledUS definite incompliant single-minded static strait-laced unbreakable unchanging unmoving unpermissive dead set locked in Noun Something hard to understand or explain koan brain-twister complexity complication confusion distraction doubt embarrassment entanglement intricacy labyrinth maze plight predicament strait Chinese puzzle knotty question tough proposition Noun Something that is difficult or impossible to understand or explain anonymity roun crime novel Noun A complicated or baffling situation or thing fix involvement obscurity snarl how-do-you-do inextricability obfuscation uphill can of worms Find more words! 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Sentences with the word tough nut to crack Words that rhyme with tough nut to crack What is the plural of tough nut to crack? Use our Synonym Finder Watch and Learn Nearby Words tough one tough out tough out it tough person tough project tough proposition tough nuts to crack tough nut tough noogies toughness of spirit toughnesses toughness