ISEE/SSAT Vocabulary BuilderWordsIindefatigable
ISEE/SSAThard
indefatigable
Meaning: able to continue working without seeming to tire
indefatigable in a sentence
How indefatigable is used in real sentences:
The indefatigable researcher spent decades tracking the disease across continents.
An indefatigable advocate, Ruiz continued the campaign long after others had withdrawn.
“An indefatigable volunteer named Luis repaired nursery pumps before dawn, then returned after work to count surviving shoots.”
— from the passage The Ninth Spring
“To test this revision, Venn interviewed Sato, now an indefatigable muralist who still spent ten-hour days painting public clinics and schools.”
— from the passage The Late Correction
Synonyms for indefatigable
Other words for indefatigable — tireless, unflagging and untiring — carry the same meaning.
- tireless
- unflagging
- untiring
Antonyms of indefatigable
Words that mean the opposite of indefatigable:
- weary
- flagging
- exhausted
Where it comes from
From Latin indefatigabilis, meaning 'not able to be wearied.'
Memory hook
IN-DE-FATIGUE-ABLE means 'not able to be fatigued': tireless in effort.
Practice indefatigable in the app