pertinaci

pertinaci is a Latin form of pertinax, meaning “persistent, stubborn, obstinate”. It is the dative singular adjective.

Found 27 times in the Latin texts on Socratos.

Where it is used

Horace, Carmina 1.9.24: aut digito male pertinaci.

All forms of pertinax (declension table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.