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Pronunciation:  `indi'fatugubul

WordNet Dictionary
[adj]  showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"

INDEFATIGABLE is a 13 letter word that starts with I.


 Synonyms: energetic, tireless, unflagging, unwearying



Webster's 1913 Dictionary
\In`de*fat"i*ga*ble\, a. [L. indefatigabilis: cf.
OF. indefatigable. See {In-} not, and {Defatigable}, and cf.
Incapable of being fatigued; not readily exhausted;
unremitting in labor or effort; untiring; unwearying; not
yielding to fatigue; as, indefatigable exertions,
perseverance, application. ``A constant, indefatigable
attendance.'' --South.

      Upborne with indefatigable wings.        --Milton.

Syn: Unwearied; untiring; persevering; persistent.

Thesaurus Terms
 Related Terms: abiding, ardent, assiduous, constant, continuing, continuous, determined, diligent, dogged, enduring, energetic, faithful, fervent, hard, hardworking, immutable, inalterable, indomitable, industrious, inexhaustible, insistent, invincible, laborious, lasting, loyal, never idle, never-tiring, obstinate, painstaking, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, rapt, relentless, remaining, resolute, sedulous, single-minded, sleepless, slogging, stable, staying, steadfast, steady, sticking, strenuous, stubborn, sustained, tenacious, tireless, unabating, unceasing, unconquerable, undaunted, undiscouraged, undrooping, undying, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unsleeping, unsparing, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, vehement, vigorous, weariless, zealous