Legions adjectives are listed in this post. Each word below can often be found in front of the noun legions in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing LEGIONS.
angelic, armed, british, countless, different
eoman, foreign, french, fresh, gallic
german, hostile, imperial, infernal, innumerable
invincible, loyal, many, mighty, more
new, other, own, roman, several
vast, veteran, victorious, whole
Hope this word list had the adjective used with legions you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.