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CaseSingularPlural
Nominativeименительный · кто? что?важный важные the subject: who or what acts
Accusativeвинительный · кого? что?важный (inanimate) / важного (animate) важные (inanimate) / важных (animate) the direct object of the verb
Genitiveродительный · кого? чего?важного важных possession, absence, "of"-phrases
Dativeдательный · кому? чему?важному важным the receiver: to or for someone
Instrumentalтворительный · кем? чем?важным важными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?важном важных location and topics: in, at, about

Важный 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 важный 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 важный and every word like it with typed case endings, checked letter by letter.

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