adjectivally

Etymology

adjectival + -ly

adv

1. As, or in the manner of, an adjective.
   In that sense, the word acts adjectivally, whereas in most cases it acts adverbially.
   ...it was observed that overt definite pronouns may also function adjectivally in various languages... 1994, Alexander Grosu, “Three Studies in Locality and Case”, in Google Books
   All attributive adjectives function adjectivally; an attributive adjective cannot function substantivally. 1999, William D. Mounce, “Basics of Biblical Greek”, in Google Books