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WORDNET DICTIONARY

Adjective tireless has 2 senses

• tireless(s = adj.all) indefatigable, unflagging, unwearying - showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
Derived form noun tirelessness₁

• tireless(s = adj.all) hardworking, industrious, untiring - characterized by hard work and perseverance; Array
Derived form noun tirelessness₁

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

tireless

active, ardent, assiduous, constant, continuing, determined, diligent, dogged, dynamic, enduring, energetic, enthusiastic, faithful, fervent, hard, hardworking, immutable, inalterable, indefatigable, indomitable, industrious, inexhaustible, insistent, invincible, laborious, lasting, lively, loyal, never idle, never-tiring, obstinate, patient, patient as Job, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, rapt, relentless, resolute, sagging, sedulous, single-minded, sleepless, slogging, spirited, stable, staunch, steadfast, steady, strenuous, stubborn, tenacious, unabating, unconquerable, undaunted, undeviating, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unsleeping, unsparing, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, vehement, vigorous, vital, weariless, zealous

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