noun

a long poem, typically one derived from ancient oral tradition, narrating the deeds and adventures of heroic or legendary figures or the past history of a nation.

heroic poem,long poem,long story,saga,legend,romance,lay,history,chronicle,myth,fable,folk tale,folk story

adjective

relating to or characteristic of an epic or epics.

our national epic poem Beowulf

heroic,long,grand,monumental,vast,Homeric,Miltonian,lofty,grandiloquent,high-flown,high-sounding,extravagant,bombastic