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CaseSingularPlural
Nominativeименительный · кто? что?опасный опасные the subject: who or what acts
Accusativeвинительный · кого? что?опасный (inanimate) / опасного (animate) опасные (inanimate) / опасных (animate) the direct object of the verb
Genitiveродительный · кого? чего?опасного опасных possession, absence, "of"-phrases
Dativeдательный · кому? чему?опасному опасным the receiver: to or for someone
Instrumentalтворительный · кем? чем?опасным опасными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?опасном опасных location and topics: in, at, about

Опасный 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 опасный 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 опасный and every word like it with typed case endings, checked letter by letter.

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