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Petrogenic
►
Thesaurus
adamantine
at a standstill
cast-iron
dour
firm
flintlike
flinty
frozen
granitelike
granitic
grim
hard
hard-core
immobile
immotile
immotive
immovable
immutable
implacable
impliable
inductile
inelastic
inexorable
inextensible
inextensile
inextensional
inflexible
intractable
intractile
intransigent
iron
irreconcilable
irremovable
irresilient
lithic
marblelike
nonelastic
nonstretchable
obdurate
pat
petrified
petrogenic
relentless
rigid
rigorous
rock
rock-ribbed
slaty
standpat
stationary
steely
stern
stiff
stone
stubborn
unaffected
unalterable
unbending
unchangeable
uncompromising
unextendible
unextensible
unflexible
ungiving
unlimber
unmalleable
unmovable
unmoved
unmoving
unpliable
unpliant
unrelenting
unswayable
untractable
unyielding
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