Synonyms: 231
tough
arduous
solid
rough
laborious
rigorous
harsh
unrelenting
severe
rigid
brutal
bitter
dense
with great effort
adamant
effortful
adverse
grim
stubborn
stark
heavily
violent
laboriously
demanding
spirituous
arduously
difficultly
hard-hearted
incomprehensible
complicated
persistent
grueling
operose
concentrated
unvoiced
surd
severely
intemperately
virulent
inebriating
burdensome
compact
constrained
indurated
knotty
treat severely
be harsh toward
be painful to
be difficult
hinder
plague
indisputable
indubitable
positive
sure
unassailable
undeniable
undisputable
unquestionable
factual
down-to-earth
hardheaded
matter-of-fact
objective
practical
pragmatic
pragmatical
prosaic
realistic
sober
tough-minded
unromantic
intoxicative
fiercely
frantically
frenziedly
furiously
strenuously
vigorously
close
nearby
nigh
unyielding
callous
impenetrable
inclement
intoxicating
intricate
iron
lasting
marble
mean
obdurate
oppressive
penetrating
perplexing
persevering
relentless
repelling
resentful
resistant
robust
rocky
rugged
ruthless
sour
stable
steely
stern
stiff
stony
strenuous
strict
stringent
strong-minded
unfeeling
unremitting
uphill
wearisome
hardness
induration
petrification
sclerosis
strenuosity
concretize
fortify
habituate
harden
indurate
inure
ossify
petrify
toilsome
alcoholic
acrimonious
adamantine
intense
petrified
stimulating
hard-bitten
hefty
powerful
two-fisted
austere
bleak
compassionless
troublesome
vengeful
exacting
incompressible
hard-handed
hardy
serious
tall
backbreaking
exigent
formidable
onerous
taxing
trying
weighty
dour
cold-blooded
stonyhearted
rancorous
inarguable
incontestable
incontrovertible
irrefutable
energetically
forcefully
forcibly
powerfully
calamitous
disastrous
excessive
exhausting
flinty
grievous
immoderate
implacable
incompliant
incorrigible
inelegant
inflexible
infrangible
insensible
insoluble
intractable
irresistible
puzzling
tiresome
uncontrollable
unendurable
unfavorable
unimpressible
unjust
unprosperous
unsparing
coarse
cold
comportment
dear
definite
diligent
distressing
durable
earnest
energetic
fit
frozen
granitic
grasping
impregnable
insensitive
gruelling
punishing
intemperate
voiceless
knockout
firmly
hard-set
perverse
cold-hearted
hard-boiled
hardened
hardhearted
heartless
embittered
closely
bad
Antonyms: 35
softly
merciful
sympathetic
sensitive
mild
pleasant
easy
facile
flexible
gently
lightly
soft
malleable
pliable
pliant
yielding
untrue
questionable
doubtful
inexact
uncertain
easily
slightly
lackadaisically
unfixedly
unenthusiastically
moderately
indulgently
tolerantly
voiced
easy-going
kind
nice
simple
disputable
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