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CaseSingularPlural
Nominativeименительный · кто? что?пустой пустые the subject: who or what acts
Accusativeвинительный · кого? что?пустой (inanimate) / пустого (animate) пустые (inanimate) / пустых (animate) the direct object of the verb
Genitiveродительный · кого? чего?пустого пустых possession, absence, "of"-phrases
Dativeдательный · кому? чему?пустому пустым the receiver: to or for someone
Instrumentalтворительный · кем? чем?пустым пустыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?пустом пустых location and topics: in, at, about

Пустой 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 пустой 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 пустой and every word like it with typed case endings, checked letter by letter.

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