sacred > sacrificial careless > unconcernedly
2 With gilden horns, and flowery garlands crowned
gilden > gilded; golden
3 (Proud of his dying honour and dear bonds,
dying honour > honour in dying (i.e. in being sacrificed) dear > costly; beloved; grievous
4 While the altars fume with frankincense around), 5 All suddenly, with mortal stroke astound,
All > [And all] mortal > lethal, death-dealing astound > stunned
6 Does grovelling fall, and with his streaming gore
grovelling > prostrate
7 Distains the pillars, and the holy ground,