Adjectives are words that describe, identify, or quantify nouns or pronouns. They typically precede the words they modify. Some examples of adjectives are "truck-shaped," "hideous," "small," "dark," "dank," "battered," and "large." Adjectives are used to describe attributes like appearance, size, characteristic, and more. Opposites of some common adjectives are also provided. In an example conversation, adjectives like "hard," "light," and "transparent" are used to describe a pencil case, while references are made to an unknown "Willy."