# pertinacious

> English word · Adjective · IPA /ˌpɜːtɪˈneɪʃəs/

## Definitions
1. Holding tenaciously to an opinion or purpose.
2. Stubbornly resolute or tenacious.

## Etymology
From pertinace + -ious, from Old French pertinace, from Latin pertinax, from per- (“very”) + tenax (“tenacious”).

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