Eternity adjectives are listed in this post. Each word below can often be found in front of the noun eternity in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing ETERNITY.
absolute, awful, blessed, blest, blissful, boundless
bright, dark, deep, divine, dread, endless
future, glorious, great, happy, inhabitest, inhabiteth
like, long, miserable, near, only, own
past, proper, same, small, timeless, true
unknown, vast, whole
Hope this word list had the adjective used with eternity you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.