Functionality adjectives are listed in this post. Each word below can often be found in front of the noun functionality in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing FUNCTIONALITY.
actual, added, additional, advanced, basic, certain, common, complete, complex, critical
desired, different, drop, enhanced, enough, equivalent, extended, extra, following, full
greater, important, improved, in, key, less, level, like, limited, main
major, more, much, necessary, new, other, overall, own, particular, powerful
proper, reduced, related, required, rich, same, side, similar, simple, special
specific, standard, such, underlying, unique, useful
Hope this word list had the adjective used with functionality you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.