An adjective is a part of speech that describes a noun and pronoun.
Most adjectives in Russian have two forms:
1. A LONG FORM (or attributive form) that usually precedes the noun / pronoun and ends in two vowels for all genders:
Example:
- красивый цветок (masculine) - beautiful flower
- красная футболка (feminine) - red T-shirt
- синее платье (neuter) - blue dress
2. A SHORT FORM (or predicative form) that usually follows the noun / pronoun and either ends in a consonant (for MASCULINE) or a vowel (for FEMININE and NEUTER):
Example:
- Он сейчас занят (masculine) на работе. He is busy at work now.
- Она слишком молода (feminine) для него. She is too young for him.
- Платье стало ей мало (neuter). The dress became small for her.
The long form is more complicated compared to the short form. It not only agrees with the noun / pronoun in gender and number, but also case (and in Russian language there are 6 cases!). So a long form of the adjective can be in Nominative masculine singular, or Geninitive feminine plural, or Dative neuter singular, and so on.
The short form, on the other hand, only agrees in gender and number, so it only has 4 different forms - masculine, feminine, neuter and plural.
If you want to learn more about Russian adjectives, read more at:
Declensions of Russian Adjectives