rested
ardent
assiduous
constant
continuing
diligent
dogged
enduring
energetic
faithful
fervent
hard
hardworking
immutable
inalterable
indefatigable
indomitable
industrious
insistent
invincible
laborious
lasting
loyal
never idle
never-tiring
obstinate
patient
patient as Job
permanent
perseverant
persevering
persistent
persisting
pertinacious
plodding
plugging
preoccupied
rapt
relentless
resolute
sedulous
single-minded
sleepless
slogging
stable
steadfast
steady
strenuous
stubborn
tenacious
disinterested
painstaking
self-sacrificing
unceasing
unfailing
unflagging
unflinching
unremitting
untiring
unwearying
well-meant