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tireless

tire·less

tireless

pronunciation:
taIr lihs
features:
Word Parts
part of speech: adjective
definition: not easily wearied; having great energy or stamina.
synonyms:
indefatigable
similar words:
active, assiduous, continuous, energetic, industrious, persistent, unceasing, unremitting
derivations: tirelessly (adv.), tirelessness (n.)
Word Parts
The word tireless contains the following part:
-less Middle English adjective-forming suffix that means without
Show wordsHide wordsMore about this word part:
The suffix -less attaches primarily to monosyllabic English nouns. However, -less is a fully productive suffix, meaning it can be added to any noun to form legitimate new words.
synonyms:
a-1, an-1
antonyms:
-ful1