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CaseSingularPlural
Nominativeименительный · кто? что?вредный вредные the subject: who or what acts
Accusativeвинительный · кого? что?вредный (inanimate) / вредного (animate) вредные (inanimate) / вредных (animate) the direct object of the verb
Genitiveродительный · кого? чего?вредного вредных possession, absence, "of"-phrases
Dativeдательный · кому? чему?вредному вредным the receiver: to or for someone
Instrumentalтворительный · кем? чем?вредным вредными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?вредном вредных location and topics: in, at, about

Вредный 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 вредный 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 вредный and every word like it with typed case endings, checked letter by letter.

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