Approximations adjectives are listed in this post. Each word below can often be found in front of the noun approximations in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing APPROXIMATIONS.
accurate, asymptotic, best, better, close
closer, crude, different, first, following
further, good, linear, many, mere
numerical, only, order, other, reasonable
rough, several, successive, such, various
Hope this word list had the adjective used with approximations you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.