Used for emphasis, not always literal. Describes tasks that seem almost impossible. They called it a herculean effort, although it was just a tough day at work.
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Motivational Context
Common in motivational speeches to inspire overcoming big challenges. With herculean determination, we can achieve our impossible dreams.
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Not Everyday Use
Mostly used in formal or literary settings rather than everyday conversation. The author described the hero's journey as a herculean quest.