herculean

Adjective
  1. Displaying superhuman strength or power (synset 301264435)
    "herculean exertions"
    similar to: superhuman - above or beyond the human or demanding more than human power or endurance
    same as: powerful
  2. Extremely difficult;
    Requiring the strength of a Hercules (synset 300751189)
    "a herculean task"
    similar to: difficult, hard - not easy; requiring great physical or mental effort to accomplish or comprehend or endure

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