Synonyms: 163
difficult
hard
sturdy
wiry
adhesive
inedible
leathery
firm
sinewy
unyielding
troublesome
puzzling
rapacious
riotous
unmanageable
tight
mighty
solid
inseparable
molded
cemented
unbreakable
dense
uncooked
half-cooked
gristly
indigestible
fibrous
tough as shoe-leather
resisting
onerous
intricate
laborious
sound
capable
savage
fierce
desperate
ferocious
ruffianly
uproarious
terrible
uncontrollable
bad
unfortunate
untimely
fine
first-class
premium
persevere
persist
endure
hard-bitten
hard-handed
hardy
rugged
stalwart
stout
arduous
backbreaking
burdensome
demanding
effortful
exacting
exigent
formidable
heavy
oppressive
rigorous
rough
taxing
trying
serious
tall
uphill
knockabout
rough-and-tumble
strenuous
harsh
rigid
stern
strict
constant
determined
resolute
steadfast
steady
stiff
unbending
uncompromising
unwavering
hoodlum
mug
roughneck
rowdy
ruffian
toughie
hood
punk
thug
hooligan
goon
gorilla
(colloq.) difficult
adamant
adamantine
aggressive
bold
cohesive
crustaceous
durable
enduring
feisty
hard-nosed
impassive
inured
obdurate
refractory
resilient
resistant
spartan
stoical
stubborn
threatening
bard
brutal
bullheaded
bully
callous
flinty
hardened
hardheaded
hardihood
mulish
obstinate
pigheaded
pugnacious
robust
ruthless
tenacity
toughness
vigorous
violent
viscous
baffling
elusive
knotty
problematic
problematical
toughened
yob
yobo
yobbo
strong-armer
street-fighter
old
coherent
in one piece
weighty
unflinching
forceful
tenacious
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