General Antonyms:
* Weak: Lacking strength or determination.
* Yielding: Giving way to pressure or force.
* Passive: Not active or assertive.
* Indecisive: Unable to make a decision.
* Flexible: Easily bent or changed.
Antonyms in Specific Contexts:
* Quitting: Giving up easily.
* Relinquishing: Giving up control or possession.
* Uncommitted: Lacking dedication or loyalty.
* Frivolous: Lacking seriousness or importance.
Examples:
* Instead of being tenacious in his pursuit of the goal, he became weak and gave up.
* The team's tenacious defense was replaced by a yielding approach, leading to a loss.
* His tenacious grip on the rope loosened, and he fell.
The best antonym for "tenacious" will depend on the specific situation and meaning you are trying to convey.