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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.

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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.

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responsible - To have control and authority over something or someone and the duty of taking care of it

She wanted to find a husband who was not only attractive, but one who is responsible and could be relied on to support a family.

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rugged - (of ground or terrain) having a broken, rocky, and uneven surface

The rugged terrain was a worthy challenge for the mountain climbers.

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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.

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unscathed - Without suffering any injury, damage, or harm

Arnold strolled away unscathed from the massive explosion behind him.

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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.

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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.

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surefire - Guaranteed to produce a desired result.

His latest song is a surefire hit—everyone is talking about it.

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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.

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ingrained - Firmly fixed or established; difficult to change; deeply embedded and hard to remove.

She practiced the piano so many hours each day, that her ability had become practically ingrained and second nature.

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imposing - Demanding attention or respect due to size, power, or presence.

His deep voice and confident posture made him an imposing figure in the courtroom.