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CaseSingularPlural
Nominativeименительный · кто? что?умный умные the subject: who or what acts
Accusativeвинительный · кого? что?умный (inanimate) / умного (animate) умные (inanimate) / умных (animate) the direct object of the verb
Genitiveродительный · кого? чего?умного умных possession, absence, "of"-phrases
Dativeдательный · кому? чему?умному умным the receiver: to or for someone
Instrumentalтворительный · кем? чем?умным умными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?умном умных location and topics: in, at, about

Умный 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 умный 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 умный and every word like it with typed case endings, checked letter by letter.

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