Tenacious (adjective)

1. Persistent in maintaining, adhering to, or seeking something valued or desired.
2. Not easily let go or discarded.

Origin:

Derived from the latin word "tenax" meaning "holding fast".

Examples:

1. He was tenacious in his pursuit of the promotion.
2. She was tenacious in her beliefs.
3. The company was tenacious in its business strategy.
4. The dog was tenacious in its grip on the toy.
5. The criminal was tenacious in avoiding capture.