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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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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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vigil - Staying awake, aware, and watchful at times when it's more usual to sleep.

The parents kept an all night vigil by their child's bedside at the hospital.

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bootcamp - A type of physical training that consists of many different types of exercise; or a short course of intensive study designed to provide someone with new skills

Alice signed up for the 3 month computer bootcamp, that promised her a great job after she graduated.

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stately - An attitude that commands respect

Queen Elizabeth's stately attitude and actions always caused people to treat her with tremendous respect.

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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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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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acute - Very sharp and intense.

He asked that his wife keep the house clean because he had such an acute sense of smell.

verb

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reinforce - To make something stronger or more powerful, often by adding additional resources, effort, or structure.

The general ordered additional troops to reinforce the front lines, knowing they were critical to holding the position.

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longevity - The ability to withstand the test of time and remain relevant or functional.

Regular exercise and a balanced diet contribute to a person's longevity.

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viable - Able to survive or live under specific conditions; also feasible or practical to implement

Starting a food truck business seems like a viable option in this city.

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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.