In Slovak grammar, adjectives are an important part of speech that serve to describe or modify nouns. Adjectives in Slovak agree with the gender, number, and case of the noun they are modifying. This means that their form changes depending on the specific attributes of the noun.

Adjectives in Slovak can be categorized into three classes: qualitative, possessive, and demonstrative. Qualitative adjectives express a quality or characteristic of the noun, such as color, size, or shape. Possessive adjectives indicate possession or ownership, and are used to show relationships between people and objects. Demonstrative adjectives, on the other hand, point out or identify a specific noun.

Slovak adjectives also undergo declension, which involves changing their endings to match that of the noun. This declension process includes four forms: masculine, feminine, neuter, and plural. Each form has its own set of endings that are added to the adjective stem.

Understanding the theory of adjectives in Slovak grammar is essential for building grammatically correct sentences and effectively describing nouns in the language.