diligent
active
ardent
assiduous
busy
constant
continuing
dogged
elaborate
enduring
energetic
faithful
fervent
hard
hardworking
hustling
immutable
inalterable
indefatigable
indomitable
industrious
insistent
invincible
laborious
lasting
loyal
never idle
never-tiring
obstinate
operose
painstaking
patient
patient as Job
permanent
perseverant
persevering
persistent
persisting
pertinacious
plodding
plugging
preoccupied
sedulity
sedulously
brass-plated
esc
law-abiding
long-continued
meticulous
microscopical
praiseworthy
punctual
self-sacrificing
strenuous
studious
thrifty
tireless
unremitted
unrewarded
unwearied
well-meant
zealous