The Collaborative International Dictionary
Attributively
Attributively \At*trib"u*tive*ly\, adv. In an attributive manner.
Wiktionary
attributively
adv. In an attributive manner.
WordNet
attributively
adv. in an attributive manner; "the genitive noun is used attributively"
Usage examples of "attributively".
But when the adjective comes immediately in front of the noun it describes, it must normally be assumed that it is used attributively and not predicatively.
We have many attested examples of adjectives being used attributively like this.
In German, adjectives do agree in number when they are used attributively, but adjectives used predicatively do not.
Somewhat like adjectives, genitives can be used both attributively and as predicates.