Indefatigable
hardin-dih-FAT-ih-guh-bul
adjective
Definition
Persisting tirelessly; unable to be fatigued
Examples
“The indefatigable researcher worked eighteen-hour days.”
“Her indefatigable efforts eventually led to success.”
Categories
GRE Tip
Indefatigable is a hard-difficulty GRE word. On the GRE, you might see it paired with synonyms like "tireless" or "unwearying" in Sentence Equivalence questions. Look for contrast clues (however, despite, although) that signal the opposite meaning. Words like "lethargic".
Related GRE Words
tireless
Having or showing great effort or energy; indefatigable
impetus
The force or energy with which a body moves; a driving force
devitalize
To deprive of strength, vitality, or energy
enervate
To cause someone to feel drained of energy; to weaken
languorous
Characterized by tiredness or inactivity; pleasantly lazy
pertinacious
Holding firmly to an opinion or course of action; persistent
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