Adjectives in Chinese require a little explanation; they work a little differently than in English. See, they don't require a verb in the sentence to work.
Linking adjectives and nouns
In Chinese, nouns don’t need a verb to be linked to adjectives. That's because in Chinese adjectives, the verb is already assumed ! When you say 小, you're not just saying "small". You're saying "to be small".
Instead of a verb, the word 很 is often used to link a noun and an adjective together. It usually means "very" but here it's mainly a way to link the noun and the adjective and doesn't add a meaning.
Structure
Noun + 很 + Adjective
Example
你 很 漂亮。 You are pretty.
Noun 很 adjective
Negating adjectives
Negating adjectives works the same way as negating verbs: the negation is placed always before the adjective.
Structure
Noun + 不 + Adjective
Example
你 不 漂亮。You are not pretty.
Noun negation adjective