An adjective is a word that describes or gives more information about a noun or pronoun. It can indicate qualities such as size, color, shape, or feelings. For example, "happy" is an adjective that describes someone's emotional state, and "red" is an adjective that describes the color of an object.

When to use it

An adjective is used to describe or modify a noun or pronoun. It provides additional information about the noun or pronoun being referred to, such as its size, color, shape, or other qualities. For example, in the phrase "the big house," the word "big" is an adjective that describes the noun "house." In English, adjectives typically come before the noun they modify, but there are exceptions to this rule. Adjectives are essential in English as they help to add detail and specificity to our language.

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Reference:

What Is an Adjective? | Definition, Types & Examples
An adjective is a word that modifies or describes a noun or pronoun. Adjectives can be used to describe the qualities of someone or something
Definition of ADJECTIVE
a word belonging to one of the major form classes in any of numerous languages and typically serving as a modifier of a noun to denote a quality of the thing named, to indicate its quantity or extent, or to specify a thing as distinct from something else… See the full definition