PERTINACIOUS

=**Pertinacious **=

Adj. very persistent; holding firmly to a course of action or a set of beliefs; hard to get rid of, refusing to be put off or denied
Synonyms: stubborn, dogged, determined

Winston Smith, the protagonist in //1984//, becomes pertinacious in resisting the Thought Police through his incessant acts of rebellion.

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After seeing that one person can improve an entire community and change the world, the pertinacious philanthropist decided to give her individual services wherever it is necessary.