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CaseSingularPlural
Nominativeименительный · кто? что?безопасный безопасные the subject: who or what acts
Accusativeвинительный · кого? что?безопасный (inanimate) / безопасного (animate) безопасные (inanimate) / безопасных (animate) the direct object of the verb
Genitiveродительный · кого? чего?безопасного безопасных possession, absence, "of"-phrases
Dativeдательный · кому? чему?безопасному безопасным the receiver: to or for someone
Instrumentalтворительный · кем? чем?безопасным безопасными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?безопасном безопасных location and topics: in, at, about

Безопасный 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 безопасный 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 безопасный and every word like it with typed case endings, checked letter by letter.

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