Indefatigable

Adjective

 * 1) Extremely persistent and untiring.
 * but he was at the same time an excellent scholar, and most indefatigable in teaching the two lads.
 * 1) * 1898, H. G. Wells, The War of the Worlds, Book 1, ch. 8:
 * All night long the Martians were hammering and stirring, sleepless, indefatigable, at work upon the machines they were making ready, and ever and again a puff of greenish-white smoke whirled up to the starlit sky.
 * All night long the Martians were hammering and stirring, sleepless, indefatigable, at work upon the machines they were making ready, and ever and again a puff of greenish-white smoke whirled up to the starlit sky.

Synonyms

 * inexhaustible, tireless, untiring, unwearying, unflagging

Antonyms

 * defatigable

Derived terms

 * indefatigably
 * indefatigability
 * indefatigableness

Adverbs for Indefatigable
sturdily; stoutly; robustly; apparently; evidently; manifestly; inordinately; surprisingly; astoundingly; astonishingly; unexpectedly; marvellously; almost; pluckily; indomitably; manfully; actively; zealously; nimbly; strenuously; resolutely; busily; restlessly; amazingly; marvellously; miraculously; unbelievably.

Thesaurus
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

Etymology
From indefatigabilis:, from in-: + de-: + fatigo:.

Pronunciation

 * , {{SAMPA|/IndI"f{tIg@bl/}}

Translations

 * Arabic: ‏لا يتعب
 * Armenian: անխոնջ, չհոգնող
 * Chinese:
 * Mandarin: 不倦
 * Czech:
 * Dutch: ,
 * Finnish: ,
 * French:
 * German: unermüdlich
 * Greek:
 * Hebrew: לא מתעיף
 * Hungarian: ,
 * Italian:


 * Macedonian: неуморен, безуморен
 * Norwegian: utrøttelig
 * Portuguese: infatigável
 * Russian: неутомимый, неустанный,  упроный
 * Scottish Gaelic:
 * Spanish: incansable,
 * Ukrainian: невтомний, неослабний