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CaseSingularPlural
Nominativeименительный · кто? что?тонкий тонкие the subject: who or what acts
Accusativeвинительный · кого? что?тонкий (inanimate) / тонкого (animate) тонкие (inanimate) / тонких (animate) the direct object of the verb
Genitiveродительный · кого? чего?тонкого тонких possession, absence, "of"-phrases
Dativeдательный · кому? чему?тонкому тонким the receiver: to or for someone
Instrumentalтворительный · кем? чем?тонким тонкими the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?тонком тонких location and topics: in, at, about

Тонкий 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 тонкий 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 тонкий and every word like it with typed case endings, checked letter by letter.

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