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CaseSingularPlural
Nominativeименительный · кто? что?страшный страшные the subject: who or what acts
Accusativeвинительный · кого? что?страшный (inanimate) / страшного (animate) страшные (inanimate) / страшных (animate) the direct object of the verb
Genitiveродительный · кого? чего?страшного страшных possession, absence, "of"-phrases
Dativeдательный · кому? чему?страшному страшным the receiver: to or for someone
Instrumentalтворительный · кем? чем?страшным страшными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?страшном страшных location and topics: in, at, about

Страшный 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 страшный 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 страшный and every word like it with typed case endings, checked letter by letter.

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