In Russian grammar, adjectives play a vital role in describing and modifying nouns. They provide additional information about the qualities, properties, or characteristics of the noun they accompany.

Adjectives in Russian can be easily recognized by their flexible endings, which change according to the gender, number, and case of the noun they refer to. This feature makes Russian adjectives highly inflected and versatile in their usage.

Russian adjectives are categorized into three genders: masculine, feminine, and neuter. Each gender has its own set of endings that determine the agreement with the noun they modify. Additionally, adjectives in Russian change their endings in accordance with the number of the noun (singular or plural) and the grammatical case it occupies (nominative, genitive, dative, accusative, instrumental, and prepositional).

Understanding the adjective theory in Russian grammar is crucial for constructing grammatically correct sentences and using adjectives accurately. Mastery of the adjective agreement and declension patterns is essential for achieving fluency in the language.