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CaseSingularPlural
Nominativeименительный · кто? что?тёмный тёмные the subject: who or what acts
Accusativeвинительный · кого? что?тёмный (inanimate) / тёмного (animate) тёмные (inanimate) / тёмных (animate) the direct object of the verb
Genitiveродительный · кого? чего?тёмного тёмных possession, absence, "of"-phrases
Dativeдательный · кому? чему?тёмному тёмным the receiver: to or for someone
Instrumentalтворительный · кем? чем?тёмным тёмными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?тёмном тёмных location and topics: in, at, about

Тёмный 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 тёмный 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 тёмный and every word like it with typed case endings, checked letter by letter.

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