Formal:
* The engineers faced a herculean task in repairing the damaged bridge after the earthquake.
* She displayed herculean strength and resilience in overcoming her illness.
Informal:
* Moving that heavy couch was a herculean effort, but we managed it in the end.
* Cleaning up after the party was a herculean task, but we all pitched in and got it done.
Figurative:
* The young entrepreneur faced herculean odds in starting her own business.
* Overcoming his fear of public speaking was a herculean feat for him.
Remember: "Herculean" refers to something requiring great strength or effort, often beyond what seems possible.