tenacity -
Holding tightly onto a opinion or goal in a determined way
The tennis player was hard to beat because he had tremendous tenacity to win and fought vigorously for every point.
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potent -
Strong, powerful, and effective
The medicine was potent enough to get rid of his headache.
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impenetrable -
Difficult or impossible to understand or comprehend; or impossible to pass through or break into.
The fortress had impenetrable walls that protected it from enemy attacks.
verb
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replenish -
To fill something or restore it to its original level, especially after it has been used or diminished.
The office staff took a break to replenish their energy with a healthy lunch before continuing their afternoon work.
adjective
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acute -
Very sharp and intense.
He asked that his wife keep the house clean because he had such an acute sense of smell.
noun
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fitness -
The condition of being physically healthy and strong, often as a result of exercise and proper nutrition
He goes to the gym daily to maintain his fitness and energy levels.
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undeniable -
Certainly true, so obvious that it cannot be doubted.
The idea that people seek pleasure and avoid pain is an undeniable truth.
verb
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enforce -
To make sure laws, rules, or regulations are obeyed.
The police are responsible for enforcing traffic laws.
noun
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bulwark -
A defensive wall
The soldiers had planned to attack, but the bulwark fortification that the enemy had built around themselves was too high to climb, and there didn't seem to be any way over, around, or through.
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fortitude -
Courage in enduring pain or hardship without giving up.
Despite the unruly crowd that seemed it could erupt in chaos at any moment, he handled the situation with great fortitude.
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linchpin -
A central, essential, or most important person or thing that holds everything together.
The team captain was the linchpin of the entire soccer team, keeping everyone motivated.
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procure -
To obtain or secure something, often through deliberate effort, care, or special means.
He managed to procure a rare antique book after months of searching through various bookstores.
