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Untiring
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Thesaurus
assiduous
cartilaginous
chewy
cohesive
constant
continuing
coriaceous
dedicated
determined
diligent
dogged
durable
enduring
faithful
fibrous
gristly
hard
hardy
immutable
inalterable
indefatigable
indomitable
industrious
inexhaustible
insistent
invincible
lasting
leatherlike
leathery
loyal
never-tiring
obstinate
patient
patient as Job
permanent
perseverant
persevering
persistent
persisting
pertinacious
plodding
plugging
preoccupied
rapt
relentless
resistant
resolute
ropy
sedulous
sinewy
single-minded
sleepless
slogging
stable
steadfast
steady
stiff
stringy
strong
stubborn
tenacious
tireless
tough
tough as leather
unabating
unconquerable
undaunted
undiscouraged
undrooping
unfailing
unfaltering
unflagging
unflinching
unintermitting
uninterrupted
unnodding
unrelaxing
unrelenting
unremitting
unsleeping
unswerving
unwavering
unwearied
unwearying
unwinking
utterly attentive
vigorous
viscid
weariless
wiry
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