powerhouse -
A person, organization, or thing that is very strong, effective, or influential in a particular field or activity.
The athlete became a powerhouse on the track, winning multiple championships and setting records.
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alacrity -
Lively and enthusiastic action or attitude.
When offered a chance to perform, he jumped on stage with alacrity.
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dynamic -
Marked by continuous and productive activity or change
The new CEO was dynamic, and totally transformed the company and made it more efficient and profitable.
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reinvigorated -
To feel a new energy and strength
After he fell and recovered, he felt totally reinvigorated within 3 months by his daily exercize plan.
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ambitious -
Having a strong desire to succeed or achieve something, and showing determination and eagerness to reach goals.
The team set an ambitious target to double sales within a year.
adjective
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rampant -
marked by a menacing wildness, extravagance, or absence of restraint
After World War I, the German economy entered a period of rampant inflation that destabilized it's society and paved the way for the rise of Nazism.
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vitality -
The state of being strong and active; energy
Despite being far older than most of the other runners, Hank's vitality shone through as he completed the marathon.
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marathon -
Any long and challenging activity, especially one that tests endurance.
We had a movie marathon and watched all eight Harry Potter films in one weekend — our brains turned to butter around film six.
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auspicious -
Marked by lucky circumstances or favorable conditions.
Jim and Jill felt that the sunny clear day of the wedding was an auspicious start to begin a new life together in their marriage.
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workout -
A session of vigorous physical exercise or training
After a day's work, Bill would stop at the gym for a 60 minute workout.
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vigorous -
Very forceful or energetic.
Winston Churchill's 'Blood, toil, tears, and sweat' speech inspired England to have a vigorous response to the German invasion of Europe, and to the attack by planes of England.
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pep -
Energy or enthusiasm
Full of pep, Nicholas couldn't contain his excitement on the first day of summer vacation.