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Unrelenting
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Dictionary
(
a.
) Not relenting; unyielding; rigid; hard; stern; cruel.
Thesaurus
adamant
adamantine
assiduous
cast-iron
constant
continuing
de longue haleine
diligent
dogged
dour
endless
enduring
extended
faithful
filled out
firm
flinty
fundamentalist
grim
hard
hard-core
hidebound
immovable
immutable
implacable
impliable
inalterable
indefatigable
indomitable
industrious
inelastic
inexorable
inflexible
insistent
intransigent
invincible
iron
ironbound
ironclad
ironhanded
irreconcilable
lasting
lengthy
long
long-drawn-out
long-spun
long-winded
longiloquent
loyal
merciless
mortal
muscle-bound
never-tiring
obdurate
obstinate
orthodox
padded
patient
patient as Job
permanent
perseverant
persevering
persistent
persisting
pertinacious
plodding
plugging
preoccupied
procrustean
prolix
protracted
purist
puristic
puritan
puritanic
rapt
relentless
resolute
rigid
rigorist
rigoristic
rigorous
rock-ribbed
rockbound
ruthless
sedulous
single-minded
sleepless
slogging
spun-out
stable
steadfast
steady
steely
stern
stiff
straightlaced
straitlaced
stubborn
talkative
tenacious
tireless
unabating
unaffected
unalterable
unappeasable
unbending
unchangeable
uncompromising
unconquerable
undaunted
undiscouraged
undrooping
unfailing
unfaltering
unflagging
unflinching
ungiving
unintermitting
uninterrupted
unmoved
unnodding
unrelaxing
unremitting
unsleeping
unswerving
untiring
unwavering
unwearied
unwearying
unwinking
unyielding
utterly attentive
verbose
weariless
windy
wordy
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