In short

A Ukrainian adjective is not a fixed word: it copies the gender, number and case of the noun it describes. You have now met all seven noun cases (lessons 4, 8, 9, 10, 19, 20, 21), so this lesson finally lets you dress every noun in an adjective that matches it everywhere. The good news: while noun endings scatter across four declension types, adjectives follow just two tidy patterns — a hard group (до́брий, нови́й) and a soft group (си́ній, оста́нній) — and each pattern has one ending per gender-and-case slot.

The rule

• An attributive adjective agrees with its noun in three things at once: gender (masculine / feminine / neuter, singular only), number (singular / plural), and case (all seven).
• Choose the ending in two steps: first work out what case the noun is in (from its role or its preposition), then give the adjective the matching cell from the table below.
• The masculine and neuter forms are identical in every case except the nominative, accusative and vocative (masc. -ий/-ій vs neut. -е/-є). Learn them as one column with three exceptions.
• In the plural there is no gender: one set of endings serves masculine, feminine and neuter together.
• Two slots borrow another case’s form, exactly as nouns do:
  • Masculine animate accusative = genitive (I see a good friend → до́брого дру́га), while masculine inanimate accusative = nominative (нови́й буди́нок).
  • Plural animate accusative = genitive (до́брих дру́зів); plural inanimate accusative = nominative (нові́ буди́нки).
• The masc./neut. locative has two equally correct forms, -ому and -ім (на до́брому столі́ / на до́брім столі́); -ому is the everyday choice.
• Hard vs soft is decided by the stem, not the meaning: hard stems take -ий, -ого, -ому, -им; soft stems take -ій, -ього, -ьому, -ім. The soft group is the smaller one, but it is open — almost all of it is the everyday -ній family (си́ній, оста́нній, дома́шній, ра́нній, сере́дній, торі́шній…).

Forms & patterns

Hard group — до́брий (good, kind). Stem-stressed; the stress stays on до́бр- through the whole paradigm.

Soft group — си́ній (blue). Same slots, softened vowels; also stem-stressed.

* The right-hand form is the animate accusative (= genitive): a masculine or plural noun that names a living being takes it, both on the adjective and on the noun.

Examples

Common mistakes

• нови́й су́кня -> нова́ су́кня — су́кня is feminine, so the adjective must take the feminine -а, not the masculine -ий.
• до́брого дру́г -> до́брого дру́га — a masculine animate object goes into the accusative-as-genitive on both words together, never on just one.
• у вели́кий буди́нку -> у вели́кому буди́нку — the locative of a masc./neut. adjective is -ому (or -ім); do not leave it in the nominative -ий.
• си́ня оліве́ць -> си́ній оліве́ць — оліве́ць is masculine; a soft-stem adjective still needs its masculine ending -ій.
• з до́брим друзя́ми -> з до́брими друзя́ми — the noun is plural, so the instrumental adjective must be plural -ими, not singular -им.
• си́нею ру́чкою -> си́ньою ру́чкою — a soft-stem feminine instrumental is -ьою; the sequence -нею belongs to no adjective type.
• Я зна́ю до́брі лю́ди -> Я зна́ю до́брих люде́й — plural animate accusative equals the genitive on both the adjective and the noun.

Tips

• Two-step reflex: find the noun’s case first, then hang the matching ending on the adjective. Never pick the adjective ending on its own.
• The question word яки́й? / яка́? / яке́? / які́? (“which? / what kind of?”) always stands in the same gender-number-case as the noun — say it to yourself as a quick agreement check.
• Do not expect the adjective and noun to share the same letters. до́брого дру́га, ново́ї кни́ги: the endings differ, yet the case matches — that is what agreement means.
• Masculine = neuter in four of seven cases; only the Nom./Acc./Voc. differ (-ий vs -е). Memorise the pair together and you have learned both.
• The plural is gender-blind: one row of endings (-і, -их, -им, -ими) covers all three genders, which shrinks the workload considerably.
• For the masc./neut. locative, prefer -ому in speech (на нові́м is a bookish variant); either is accepted.
• Soft or hard is a stem shape, not a list to learn: if the masculine nominative ends in -ій, take the soft column; if it ends in -ий, take the hard one. That makes сусі́дній, ве́рхній, поро́жній, коли́шній, тре́тій just as soft as си́ній.