Added to a substantive as an attribute; of the nature of an adjunct; as, an adjective word or sentence.
A word used with a noun, or substantive, to express a quality of the thing named, or something attributed to it, or to limit or define it, or to specify or describe a thing, as distinct from something else. Thus, in phrase, "a wise ruler," wise is the adjective, expressing a property of ruler.
The part of speech modifying a noun or a pronoun. Adjectives are words such as shy, sleepy, attractive, famous, historic; three men, this class, another one; young, younger, youngest; good, better, best. Adjective-making suffixes are -al, -able, -ant, -at