In linguistics, an adjective (abbreviated adj) is a word that modifies a noun or noun phrase or describes its referent. Its semantic role is to change information given by the noun.
Adjectives come in several varieties, including superlative and comparative.
What are adjectives? BBC Bitesize
An adjective is a word that describes a noun (the name of a thing or a place).
Adjective definition, any member of a class of words that modify nouns and pronouns, primarily by describing a particular quality of the word they are modifying, as wise in a wise grandmother, or perfect in a perfect score, or handsome in he is extremely handsome.