WordNet sense 1 (a long narrative poem telling of a hero's deeds):

epos, epic poem, heroic poem

WordNet sense 2 (constituting or having to do with or suggestive of a literary epic):

epical

WordNet sense 3 (very imposing or impressive; surpassing the ordinary (especially in size or scale)):

heroic, larger-than-life

WordNet sense 4 (above average in size or number or quantity or magnitude or extent):

big, large