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CaseSingularPlural
Nominativeименительный · кто? что?твёрдый твёрдые the subject: who or what acts
Accusativeвинительный · кого? что?твёрдый (inanimate) / твёрдого (animate) твёрдые (inanimate) / твёрдых (animate) the direct object of the verb
Genitiveродительный · кого? чего?твёрдого твёрдых possession, absence, "of"-phrases
Dativeдательный · кому? чему?твёрдому твёрдым the receiver: to or for someone
Instrumentalтворительный · кем? чем?твёрдым твёрдыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?твёрдом твёрдых location and topics: in, at, about

Твёрдый 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 твёрдый 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.

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Slova drills твёрдый and every word like it with typed case endings, checked letter by letter.

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