Synonyms for tough nut to crack
- adamant
- bullhead
- callous
- cold fish
- dogged
- firm
- fixed
- hanging tough
- hard
- hard-boiled
- hard-hearted
- hard-nosed
- harsh
- heartless
- immovable
- implacable
- indurate
- inexorable
- inflexible
- iron
- mean
- mulish
- obstinate
- perverse
- relentless
- rigid
- set in stone
- stiff-necked
- thick-skinned
- tough
- unbending
- uncompassionate
- uncompromising
- uncooperative
- unemotional
- unfeeling
- unimpressible
- unrelenting
- unshakable
- unsympathetic
- unyielding
MOST RELEVANT
Antonyms for tough nut to crack
MOST RELEVANT
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.
RELATED WORDS AND SYNONYMS FOR TOUGH NUT TO CRACK
enigma
nounmysterymore rigid
adjectivestiff, strict, severe- adamant
- adamantine
- austere
- bullheaded
- changeless
- chiseled
- dead set
- definite
- determined
- exact
- firm
- fixed
- hard
- hard-line
- harsh
- incompliant
- inelastic
- inexorable
- inflexible
- intransigent
- invariable
- locked in
- obdurate
- rigorous
- set
- set in stone
- single-minded
- solid
- static
- stern
- strait-laced
- stringent
- tough nut to crack
- unalterable
- unbending
- unbreakable
- unchanging
- uncompromising
- undeviating
- unmoving
- unpermissive
- unrelenting
- unyielding
mysteries
nounpuzzle, secret- abstruseness
- brainteaser
- braintwister
- charade
- chiller
- cliffhanger
- closed book
- conundrum
- crux
- cryptogram
- difficulty
- enigma
- grabber
- inscrutability
- inscrutableness
- mindboggler
- mystification
- occult
- oracle
- perplexity
- poser
- problem
- puzzlement
- question
- rebus
- riddle
- rune
- secrecy
- sixty-four-thousand-dollar question
- sphinx
- stickler
- stumper
- subtlety
- teaser
- thriller
- tough nut to crack
- twister
- whodunit
- why
mystery
nounpuzzle, secret- abstruseness
- brainteaser
- braintwister
- charade
- chiller
- cliffhanger
- closed book
- conundrum
- crux
- cryptogram
- difficulty
- enigma
- grabber
- inscrutability
- inscrutableness
- mindboggler
- mystification
- occult
- oracle
- perplexity
- poser
- problem
- puzzlement
- question
- rebus
- riddle
- rune
- secrecy
- sixty-four-thousand-dollar question
- sphinx
- stickler
- stumper
- subtlety
- teaser
- thriller
- tough nut to crack
- twister
- whodunit
- why
obdurate
adjectivepigheaded, stubborn- adamant
- bullhead
- callous
- cold fish
- dogged
- firm
- fixed
- hanging tough
- hard
- hard-boiled
- hard-hearted
- hard-nosed
- harsh
- heartless
- immovable
- implacable
- indurate
- inexorable
- inflexible
- iron
- mean
- mulish
- obstinate
- perverse
- relentless
- rigid
- set in stone
- stiff-necked
- thick-skinned
- tough
- tough nut to crack
- unbending
- uncompassionate
- uncompromising
- uncooperative
- unemotional
- unfeeling
- unimpressible
- unrelenting
- unshakable
- unsympathetic
- unyielding
perplexity
nounmystery- abstruseness
- brainteaser
- braintwister
- charade
- chiller
- cliffhanger
- closed book
- conundrum
- crux
- cryptogram
- difficulty
- enigma
- grabber
- inscrutability
- inscrutableness
- mindboggler
- mystification
- occult
- oracle
- poser
- problem
- puzzle
- puzzlement
- puzzler
- question
- rebus
- riddle
- rune
- secrecy
- sixty-four-thousand-dollar question
- sphinx
- stickler
- stumper
- subtlety
- teaser
- thriller
- tough nut to crack
- twister
- whodunit
- why
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.