Adjectives — Definition, Examples, and Uses
What is an adjective?
An adjective is a part of speech used to modify (describe) a noun, pronoun, or noun phrase. These descriptions typically include characteristics (e.g., colossal, blue, speedy, cautious) or quantity (e.g., several, few, nine, hundreds).
When a group of words contains a subject and verb and functions as an adjective, it is an adjective clause:
The car that Chris bought ten years ago finally broke down.
Noun: car
Subject: Chris
Verb: bought
Adjective: ten years ago

When the subject and verb are removed from an adjective clause, it becomes an adjective phrase or compound adjective and usually uses hyphens:
The ten-year-old car finally broke down.
Noun: car
Adjective: ten-year-old
Multiple adjectives can be strung together to describe the same noun. These are called coordinate adjectives and are separated by commas:
It was a beautiful, bright, sunny day.
What do adjectives describe?
1) The main role of an adjective is to describe a noun:
The sneaky dog was able to lift the lid of the metal trash can.
2) They can act as a complement to linking verbs or the verb "to be." A linking verb describes a state of being, such as "to feel" or "to taste." These adjectives are called predicate adjectives.