tenacious
(tĕ·'nay·shŭs)
[adj.]
1. holding firmly to something, such as a right or principle; persistent, stubbornly unyielding.
2. holding firmly, cohesive.
3. sticking firmly, adhesive.
4. (of memory) retentive.
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ExampleExample
When it comes to fighting for equality, she is the most tenacious person I know.