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operational - Something that is in working order and ready for use.

SpaceX is looking forward to the day that a community on Mars becomes fully operational.

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resilient - To withstand adversity; show a quick recovery following adversity.

The cowboys living in the wild west had to be resilient to survive in an environment of untamed elements.

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potent - Strong, powerful, and effective

The medicine was potent enough to get rid of his headache.

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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.

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formidable - Inspiring fear or respect as a result being impressively powerful, intense, or capable.

Though he had big investors for his AI startup, he knew he had to overcome formidable competition against dozens of competing companies.

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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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clout - Influence or power, especially in politics or business

The speaker realized he had clout when dozens of people showed up on short notice to hear him speak.

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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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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.