marathon -
Referring to an activity that takes a long time and a great deal of effort
After the company's computers crashed, 30 programmers worked together in a 15 hour marathon debugging session to get the computers up and running again.
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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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intensity -
Great energy, strength, and concentration involving an activity, thought, or feeling.
During the war, the intensity of the battles decreased in the winter when it was just too cold to fight.
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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.
verb
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blossom -
To fufill one's potential by becoming more attractive, successful, or confident.
A year after graduating law school, Wendy blossomed as an eloquent court attorney.
noun
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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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avid -
Showing a keen desire or craving for something.
He showed avid interest in learning how to play the guitar, and practiced several hours a day.
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vigor -
Physical strength and good health
A bicycle-oriented workout will result in increased vigor over time.
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peppy -
Lively and high-spirited
Landon's dog was so peppy that he ran 50 yards in a matter of seconds.