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ironclad - So strong that it cannot be challenged or changed

When World War II started, Fred's ironclad loyalty to his country caused him to enlist in the army immediately.

adjective

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impregnable - Unable to be broken into or captured.

The high walls around the city made it impregnable when attacked or under siege.

noun

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prowess - Skill or expertise in a particular activity or field

Without a doubt, Michael Jordan possessed an exceptional prowess on the basketball court.

adjective

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rigorous - Extremely thorough, exhaustive, or accurate

Before being sent to battle, military members must go through rigorous training in boot camp.

adjective

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sober - Serious and thoughtful in mood or behavior, not playful or exaggerated; or not under the influence of alcohol or drugs; clear-minded.

It was a year since he gave up drinking and had decided to remain sober all the time, and it took strength to just walk past the bar.

adjective

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sturdy - Strong and solid and unlikely to break

The family built a tree house that proved to be very sturdy even during storms

verb

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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.

noun

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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.

noun

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pushback - A reaction against a proposal, idea, or action, often in the form of disagreement or objection.

The manager faced significant pushback from the employees when he announced the new changes to the work schedule.

noun

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panacea - A solution or remedy for all problems or difficulties.

Many people hoped the new policy would be a panacea for the world's economic problems.

noun

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crusade - An energetic campaign for political, social, or religious change

Martin Luther King's life was a continuous crusade to improve the lives of his fellow blacks.

adjective

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impervious - Not allowing something to pass through; impenetrable; not affected or influenced by something.

In spite of the pressure of round-the-clock studying, he seemed impervious to the constant stress, and did remarkably well.