herculean[adjective]Synonyms: huge, colossal, enormous, gargantuan, giant, gigantic, immense, mammoth, titanic, vast
[TahlilGaran] English Synonym Dictionary ▲
her‧cu‧le‧an /ˌhɜːkjʊˈliːən◂, hɜːˈkjuːliən $ -ɜːr-/
adjective needing great strength or determination:
a herculean task [TahlilGaran] Dictionary of Contemporary English ▲