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CaseSingularPlural
Nominativeименительный · кто? что?интересный интересные the subject: who or what acts
Accusativeвинительный · кого? что?интересный (inanimate) / интересного (animate) интересные (inanimate) / интересных (animate) the direct object of the verb
Genitiveродительный · кого? чего?интересного интересных possession, absence, "of"-phrases
Dativeдательный · кому? чему?интересному интересным the receiver: to or for someone
Instrumentalтворительный · кем? чем?интересным интересными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?интересном интересных location and topics: in, at, about

Интересный is an adjective: it copies the gender, number, and case of its noun. The table shows masculine and plural; feminine and neuter follow the same stem with their own endings.

Look up any other word in the Russian declension tool, see where интересный ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills интересный and every word like it with typed case endings, checked letter by letter.

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