Source : Webster's Revised Unabridged Dictionary (1913)

Unremitting \Un`re*mit"ting\, a.
   Not remitting; incessant; continued; persevering; as,
   unremitting exertions. --Cowper. -- {Un`re*mit"ting*ly}, adv.
   -- {Un`re*mit"ting*ness}, n.

Source : WordNet®

unremitting
     adj : 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" [syn: {ceaseless}, {constant},
            {incessant}, {never-ending}, {perpetual}, {unceasing}]