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

unflagging \unflagging\
   see flagging.
see also:
flagging 

[2] : WordNet (r) 2.0

unflagging
     adj 1: showing sustained enthusiastic action with unflagging
            vitality; "an indefatigable advocate of equal rights";
            "a tireless worker"; "unflagging pursuit of
            excellence" syn: indefatigable, tireless, unwearying
     2: unceasing; "unfailing loyalty"; "unfailing good spirits";
        "unflagging courtesy" syn: unfailing
see also:
indefatigable tireless unwearying unfailing 

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

91 moby thesaurus words for "unflagging":
   ardent, assiduous, constant, continuing, diligent, dogged,
   enduring, energetic, faithful, fervent, going strong, hard,
   hardworking, immutable, in full force, in full swing, inalterable,
   indefatigable, indomitable, industrious, inexhaustible, insistent,
   invincible, laborious, lasting, loyal, never idle, never-tiring,
   obstinate, patient, patient as job, permanent, perseverant,
   persevering, persistent, persisting, pertinacious, plodding,
   plugging, preoccupied, rapt, relentless, resolute, sedulous,
   single-minded, sleepless, slogging, stable, steadfast, steady,
   strenuous, stubborn, tenacious, tireless, unabated, unabating,
   unallayed, unbated, unconquerable, undaunted, undiminished,
   undiscouraged, undrooping, unexhausted, unfaded, unfailing,
   unfaltering, unflinching, unintermitting, uninterrupted, unnodding,
   unrelaxing, unrelenting, unremitting, unshaken, unsleeping,
   unsparing, unswerving, untiring, unwavering, unweakened,
   unweakening, unwearied, unwearying, unwinking, unwithered, unworn,
   utterly attentive, vehement, weariless, zealous

Unflagging >> U Words
Unflagging, definition of term: Unflagging
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