An Adjective is a word which describes something.
[An adjective is] 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. 
Examples of adjectives in sentences:
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- The many insulting adjectives the British Parliament used to describe Donald Trump Many of these are insulting Nouns rather than adjectives.