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in the PONS Dictionary

per·ti·nac·ity [ˌpɜ:tɪˈnæsəti, Am ˌpɜ:rtənˈæsət̬i] N no pl form

pertinacity (perseverance)
Beharrlichkeit f <->
pertinacity (stubbornness)
Hartnäckigkeit f <->
with indefatigable pertinacity
unermüdlich
with indefatigable pertinacity
mit unermüdlicher Ausdauer

Examples from the PONS Dictionary (editorially verified)

with indefatigable pertinacity
mit unermüdlicher Ausdauer

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