UNREMITTING
ceaseless, constant, incessant, never-ending, perpetual, unceasing, unremitting
(adjective) uninterrupted in time and indefinitely long continuing; “the ceaseless thunder of surf”; “in constant pain”; “night and day we live with the incessant noise of the city”; “the never-ending search for happiness”; “the perpetual struggle to maintain standards in a democracy”; “man’s unceasing warfare with drought and isolation”; “unremitting demands of hunger”
Source: WordNet® 3.1
Etymology
Adjective
unremitting (comparative more unremitting, superlative most unremitting)
incessant; never slackening
Source: Wiktionary
Un`re*mit"ting, a.
Definition: Not remitting; incessant; continued; persevering; as,
unremitting exertions. Cowper.
– Un`re*mit"ting*ly, adv.
– Un`re*mit"ting*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition