[1] : The Collaborative International Dictionary of English v.0.48

ceaseless \cease"less\, a.
   without pause or end; incessant.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

ceaseless \cease"less\, adv.
   without intermission or end.
   1913 webster

[3] : WordNet (r) 2.0

ceaseless
     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: constant, incessant,
            never-ending, perpetual, unceasing, unremitting
see also:
constant incessant never-ending perpetual unceasing unremitting 

[4] : Moby Thesaurus II by Grady Ward, 1.0

86 moby thesaurus words for "ceaseless":
   ageless, amaranthine, articulated, catenated, chattering,
   coeternal, concatenated, connected, constant, continual, continued,
   continuing, continuous, cyclical, dateless, direct, endless,
   eternal, eterne, ever-being, ever-durable, ever-during,
   everlasting, everliving, featureless, gapless, immediate,
   immemorial, immortal, incessant, indestructible, infinite,
   interminable, joined, jointless, linked, machine gun, monotonous,
   never-ceasing, never-ending, nonstop, nonterminating, nonterminous,
   olamic, oscillating, perdurable, perennial, periodic, permanent,
   perpetual, pulsating, rapid, recurrent, regular, repeated,
   repetitive, round-the-clock, running, seamless, sempiternal,
   serried, smooth, stable, staccato, steady, straight, stuttering,
   sustained, timeless, twenty-four-hour, unbroken, unceasing,
   unchanging, undifferentiated, unending, uniform, unintermitted,
   unintermittent, unintermitting, uninterrupted, unrelieved,
   unremitting, unstopped, unvarying, vibrating, without end

Ceaseless >> C Words
Ceaseless, definition of term: Ceaseless
ceaseless_pag1.html