Definition of "adjective"

"They'll have to invent new adjectives when I come back. You wait!"

1932, Delos W. Lovelace, King Kong, published 1965, page 8

it must be an adjective of dain

1648, Thomas Fuller, The History of the University of Cambridge since the Conquest

The whole English law, substantive and adjective.

1849–1861, Thomas Babington Macaulay, chapter 10, in The History of England from the Accession of James the Second, volumes (please specify |volume=I to V), London: Longman, Brown, Green, and Longmans

In fact, God is of not so much importance in Himself, but as the end towards which man tends. That irreverent person who said that Browning uses “God” as a pigment made an accurate criticism of his theology. In Browning, God is adjective to man.

1899, John Jay Chapman, Emerson and Other Essays, AMS Press (1969) (as reproduced in Project Gutenberg)

Language has as much occasion to adjective the distinct signification of the verb, and to adjective also the mood, as it has to adjective time. It has […] adjectived all three.

1805, John Horne Tooke, Epea Pteroenta: or The Diversions of Purley Part 2

In English, instead of adjectiving our own substantives, we have borrowed, in immense numbers, adjectived signs from other languages […]

1832, William Hunter, An Anglo-Saxon grammar, and derivatives, page 46