Added 10 October 2026
pertinacious
/ˌpɜːtɪˈneɪʃəs/ adjective
Latin root: pertinax Wiktionary
adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about pertinacious at Wordnik → Where our words come from →
Origin
From pertinace + -ious, from Old French pertinace, from Latin pertinax, from per- (“very”) + tenax (“tenacious”).
From Wiktionary, via Kaikki.org (CC BY-SA)