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CaseSingularPlural
Nominativeименительный · кто? что?голубой голубые the subject: who or what acts
Accusativeвинительный · кого? что?голубой (inanimate) / голубого (animate) голубые (inanimate) / голубых (animate) the direct object of the verb
Genitiveродительный · кого? чего?голубого голубых possession, absence, "of"-phrases
Dativeдательный · кому? чему?голубому голубым the receiver: to or for someone
Instrumentalтворительный · кем? чем?голубым голубыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?голубом голубых location and topics: in, at, about

Голубой 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 голубой 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 голубой and every word like it with typed case endings, checked letter by letter.

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