indefatigable
C2CEFR level
65/100Rarity: rare
FormalRegister
General adjective
Persisting tirelessly.
An indefatigable campaigner, she knocked on every door.
Business adjective
Persisting tirelessly without any sign of exhaustion.
Her indefatigable pitching finally wore down the sceptical lead investor.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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