Pertinacious
/ˌpɜːrtnˈeɪʃəs/
Definition 1 of 2
Pro Tip 1/3Positive Connotation
Often suggests a noble quality of character, admired for dedication and resolve. 
Her pertinacious efforts in the charity work earned her widespread respect.
Pro Tip 2/3Emotional Undertone
Can imply strong emotional commitment to a cause or task. 
He was pertinacious in advocating for environmental protection.
Pro Tip 3/3Not Always Positive
May sometimes suggest excessive stubbornness or inability to adapt. 
Her pertinacious refusal to listen to advice led to the project's failure.
Compare with
DetermineDoggedIntransigentObduratePersistentResoluteStubbornTenacious
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