Potential answers for "Herculean undertaking"

⭐⭐⭐⭐ ORDEAL
⭐⭐ HARD
⭐⭐ FOLLY
⭐⭐ HYDRA
⭐⭐ NEMEA
⭐⭐ TASK
⭐⭐ CAUSE
⭐⭐ POIROT
⭐⭐ COMBATMISSION
⭐⭐ POLL

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