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Thesaurus
adamant
adamantine
at a standstill
cast-iron
certain
changeless
closed to
constant
determinate
determined
dogged
dour
dyed
established
fated
fateful
firm
fixed
flinty
frozen
fundamentalist
grim
hard
hard and fast
hard-core
hard-line
headstrong
hidebound
immobile
immotile
immotive
immovable
immutable
impersuadable
impersuasible
impervious
implacable
impliable
inalterable
indefeasible
indomitable
inductile
inelastic
ineluctable
inescapable
inevasible
inevitable
inexorable
inextensible
inextensile
inextensional
intractable
intractile
intransigent
invariable
invincible
iron
ironbound
ironclad
ironhanded
irreconcilable
irremovable
irresilient
irresistible
irrevocable
loyal
mulish
muscle-bound
necessary
nonelastic
nonstretchable
obdurate
obstinate
orthodox
pat
pigheaded
procrustean
purist
puristic
puritan
puritanic
refractory
relentless
resistless
resolute
resolved
rigid
rigorist
rigoristic
rigorous
rock-ribbed
rockbound
set
settled
severe
single-minded
sot
standpat
stationary
staunch
steadfast
steady
steely
stern
stiff
stony
straightlaced
straitlaced
strict
stubborn
sure
sure as death
sure as fate
TRUE
unaccommodating
unadaptable
unaffected
unalterable
unamenable
unavoidable
unbending
unchangeable
unchanging
uncompliant
uncompromising
unconquerable
uncontrollable
undeflectable
unextendible
unextensible
unflappable
unflexible
ungiving
unimpressionable
uninfluenceable
unlimber
unmalleable
unmodifiable
unmovable
unmoved
unmoving
unpersuadable
unpliable
unpliant
unpreventable
unreceptive
unrelenting
unresponsive
unshakable
unshakeable
unshaken
unstoppable
unsuggestible
unsusceptible
unswayable
unswerving
untractable
unvaried
unvarying
unyielding
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