Answer

Let's understand what is adjective ?

The simplest definition of an adjective is that it is a word that describes or clarifies a noun. Adjectives describe nouns by giving some information about an object's size, shape, age, color, origin or material.

So the adjective is the given sentence would be:

Sentence: I disliked such behavior.

Adjective: Such; why? Because it describes the quality of the noun(behaviour).