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CaseSingularPlural
Nominativeименительный · кто? что?сложный сложные the subject: who or what acts
Accusativeвинительный · кого? что?сложный (inanimate) / сложного (animate) сложные (inanimate) / сложных (animate) the direct object of the verb
Genitiveродительный · кого? чего?сложного сложных possession, absence, "of"-phrases
Dativeдательный · кому? чему?сложному сложным the receiver: to or for someone
Instrumentalтворительный · кем? чем?сложным сложными the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?сложном сложных location and topics: in, at, about

Сложный 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 сложный 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 сложный and every word like it with typed case endings, checked letter by letter.

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