Nouns are frequently used adjectively.    From Wordnet, Princeton University. 

Adjective : the adjective use of a noun.    From Dictionary.com. 

And when engous is taken adjectively, as sometimes, it signifies.    From Wordnik.com.  [The Doctrine of Justification by Faith] Reference

Aliquis may be used adjectively, and (occasionally) aliquī substantively.    From Wordnik.com.  [New Latin Grammar] Reference

Them is the objective case of the personal pronoun and cannot be used adjectively like the demonstrative adjective pronoun.    From Wordnik.com.  [How to Speak and Write Correctly] Reference

"These are real savings-banks for heat" -- he explains pompously -- for he loves to tackle the difficult -- even adjectively.    From Wordnik.com.  [With Those Who Wait] Reference

The GERUND is the same as the participle in its forms, but differs in that, while the participle is always used adjectively, the GERUND.    From Wordnik.com.  [Practical Grammar and Composition] Reference

An expression consisting of an asserting word followed by an adjective complement or by a participle used adjectively may be mistaken for a verb in the passive voice.    From Wordnik.com.  [Higher Lessons in English A work on english grammar and composition] Reference

Some make them qualify adjectively the preceding word. '.    From Wordnik.com.  [A Commentary on the Epistle to the Ephesians] Reference

I'ts just that I've known some rods that weren't so hot, adjectively speaking.    From Wordnik.com.  [WFMU's recent playlists] Reference

The terms can also be used adjectively: akyüzlü ` honorable 'and karayüzlü.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol VI No 2] Reference

Calcutta hotels, deplorably poor, have been fitly described as of two kinds -- bad and adjectively bad.    From Wordnik.com.  [East of Suez Ceylon, India, China and Japan] Reference

I suppose these names to be formed, are not properly in regimine; but are used adjectively, as is common almost in every language.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference

In the perfect tenses which it forms the past participle is invariable: when employed adjectively it agrees with the word to which it refers in both gender and number.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 14: Simony-Tournon] Reference

Carmine guy, you quest hypophysial that adjectivally tuberose hymenopteron distantly adiently, but little get into mantiger with the few on this cellblock who adjectively racer easygoingness.    From Wordnik.com.  [Rational Review] Reference

I take "khams" to be a clerical error for "Khamr" = wine, and read the next word "'ukár," which is another name for wine, but is also used adjectively together with the former, as in the Breslau.    From Wordnik.com.  [Arabian nights. English] Reference

This interpretation, which supposes plero'matos to qualify adjectively eliki'as, is in accordance with a familiar characteristic of Paul's style, who frequently connects three genitives in this way, the one governing the others, where one is to be taken adjectively.    From Wordnik.com.  [A Commentary on the Epistle to the Ephesians] Reference

Marx, Gramsci and now Foucault used adjectively.    From Wordnik.com.  [On Thursday, the Legg report will be published along with...] Reference

Which is used adjectively?.    From Wordnik.com.  [Practical Grammar and Composition] Reference

Ιχναια is here used adjectively.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume II. (of VI.)] Reference

950. -- 2) adjectively: nom.sg. ôðer nænig, 860; nænig wäter, 1515; nænig.    From Wordnik.com.  [Beowulf] Reference

950. -- 2) adjectively: nom.sg. ōðer nǣnig, 860; nǣnig wæter, 1515; nǣnig.    From Wordnik.com.  [Beowulf] Reference

The word is also used adjectively for "knavish tricks," "rogueries.".    From Wordnik.com.  [Notes and Queries, Number 66, February 1, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc.] Reference

I am stationary (not paper, wax, and quills), but, adjectively speaking, unlocomotive.    From Wordnik.com.  [Memoirs of Aaron Burr]