Synonyms: 154
relentless
inflexible
cruel
unchanging
harsh
exacting
acute
arduous
firm
unrelenting
hard
brutal
heavy
serious
formidable
taxing
trying
extreme
inclement
ironclad
life-threatening
terrible
wicked
unbending
obdurate
with an iron will
unyielding
sharp
domineering
uncompromising
inexorable
rigid
grim
strict
despotic
dangerous
exact
determined
inconsiderate
immovable
as firm as the Rock of Gibraltar
adamant
mordant
drastic
unmerciful
rigorous
pitiless
critical
gruff
unmitigated
intractable
stubborn
draconian
with a heart of granite
stony-hearted
stark
hefty
powerful
momentous
weighty
burdensome
demanding
exigent
laborious
onerous
chronic
coarse
cold
crucial
dour
excruciating
fierce
grave
grievous
grueling
intense
methodical
rough
scathing
sober
spartan
unadorned
unembellished
unpleasant
unsparing
rigor
close
austere
stern
unalterable
oppressive
grinding
peremptory
resolute
earnest
stiff
forbidding
resolved
strait-laced
unfeeling
insensate
bullying
flagrant
plain
knockout
overbearing
tyrannical
stringent
ascetic
implacable
unjust
barbarous
censorious
crusty
crabbed
autocratic
hard-shell
rock-ribbed
hidebound
tough
bleak
bitter
backbreaking
effortful
afflictive
astringent
atrocious
biting
blistering
caustic
cutting
deadly
distressing
heinous
hostile
lamentable
moralistic
painful
precise
puritanical
sedate
simple
solemn
straitlaced
strenuous
uncharitable
vehement
violent
austerity
harshness
inclemency
severity
stringency
vehemence
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