# indefatigable

> English word · Adjective · IPA /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/ · frequency rank #50,002

## Definitions
1. Extremely persistent and untiring.

## Etymology
From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/indefatigable