It is a herculean task for me.

Solution (By Examveda Team)

Herculean : requiring great strength or effort.
Indecent : not conforming with generally accepted standards of behaviour, especially in relation to sexual matters.
Puny : small and weak.
Ponderous : slow and clumsy because of great weight.
Big : of considerable size or extent.

Antonym of Herculean is Puny