indefatigable
- adjective (adj)
Meaning: untiring
Synonyms:
active
assiduous
bound and determined
dead set on
determined
diligent
dogged
energetic
hell-bent
industrious
inexhaustible
ironclad
nose to grindstone
painstaking
patient
persevering
persistent
pertinacious
relentless
sedulous
steadfast
stop at nothing
strenuous
tireless
unfaltering
unflagging
unflinching
unremitting
unwavering
unwearied
unwearying
vigorous
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.