Hard Adjectives: the -ý/-á/-é Pattern | Czech Grammar

In English an adjective is a frozen word: a young man, with a young woman, about young people — young never changes. Czech could not be more different. An adjective must agree with its noun in gender, number, AND case, so its ending shifts every single time the noun's case shifts. The biggest and most important class is the hard type, named for the hard stem consonant before the ending. Its model word is mladý (young), and once you can run mladý through the cases, you can decline the thousands of adjectives that end in -ý in their dictionary form: nový (new), starý (old), dobrý (good), velký (big), krásný (beautiful), and so on.

The signature: long vowels

The hard type is instantly recognisable by its long vowels: -ého (genitive), -ému (dative), -ým (instrumental), -ých (genitive/locative plural), -ými (instrumental plural). Whenever you see those long endings on a modifier, you are looking at a hard adjective. Compare them with the short, all--í endings of the soft type (jarní): that contrast is the whole reason Czech splits adjectives into hard vs soft.

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If you remember nothing else, remember the three long masculine/neuter endings -ého, -ému, -ým. They appear constantly and are the fingerprint of the hard adjective class.

The full paradigm of mladý

Singular	Masc. animate	Masc. inanimate	Feminine	Neuter
Nom.	mladý	mladý	mladá	mladé
Gen.	mladého	mladého	mladé	mladého
Dat.	mladému	mladému	mladé	mladému
Acc.	mladého	mladý	mladou	mladé
Loc. (o…)	mladém	mladém	mladé	mladém
Instr.	mladým	mladým	mladou	mladým

Plural	Masc. animate	Masc. inanimate	Feminine	Neuter
Nom.	mladí	mladé	mladé	mladá
Gen.	mladých	mladých	mladých	mladých
Dat.	mladým	mladým	mladým	mladým
Acc.	mladé	mladé	mladé	mladá
Loc. (o…)	mladých	mladých	mladých	mladých
Instr.	mladými	mladými	mladými	mladými

Notice how much work the long vowels do, and how the plural genitive, dative, locative, and instrumental collapse to one form each across all genders (mladých, mladým, mladých, mladými). That is a small mercy: in the plural you mostly stop worrying about gender.

The adjective moves with the noun

The single rule that governs everything: the adjective copies the gender, number, and case of its noun. So as the noun marches through the cases, mladý marches in lockstep beside it.

To je mladý muž.

That's a young man. (nominative — muž is masculine)

Seznámila jsem se s jedním mladým mužem.

I met a young man. (instrumental after s — mladým mužem)

Mluvili jsme o mladé herečce z toho seriálu.

We were talking about the young actress from that series. (feminine locative — mladé herečce)

Same young, three different endings — mladý, mladým, mladé — because man and actress are different genders and sit in different cases. An English speaker's instinct is to leave the adjective alone; you must retrain that instinct so the adjective ending becomes automatic.

This is agreement, and it is worth understanding rather than just obeying. The adjective carries no case meaning of its own — it is borrowing the gender, number, and case of its noun and wearing them as a kind of badge. In a Czech sentence that badge is genuinely useful: because mladým can only be masculine (or neuter) instrumental, a listener already knows what kind of noun is coming before it arrives, and the matching endings tie the phrase together even when other words separate the adjective from its noun. English gets by without this because its rigid word order does the same job; Czech, with its free word order, leans on agreement instead. So every ending you add is not decoration — it is the glue that says "these two words belong together."

The masculine animacy split in the accusative

Czech masculine nouns divide into animate (people, animals) and inanimate (things), and this split surfaces in the accusative singular. An animate masculine adjective takes -ého (looking exactly like the genitive), while an inanimate one keeps the bare nominative -ý:

Vidím mladého muže na druhé straně ulice.

I can see a young man on the other side of the street. (animate accusative — mladého muže)

Na zahradě jsme zasadili mladý strom.

We planted a young tree in the garden. (inanimate accusative — mladý strom, unchanged)

This animacy distinction runs through the whole noun-and-adjective system; the masculine-animate plural is where it gets its own special ending -í (mladí muži), with the stem consonant softening before it.

More cases in natural sentences

Tahle práce je ideální pro mladé lidi.

This job is ideal for young people. (accusative plural — mladé lidi)

Pomohl jsem jednomu mladému studentovi s úkolem.

I helped one young student with his homework. (dative — mladému studentovi)

Je to román od velmi mladé spisovatelky.

It's a novel by a very young writer. (feminine genitive — mladé spisovatelky)

Mladí lidé dnes hodně cestují.

Young people travel a lot these days. (animate nominative plural — mladí, with the stem softened)

A register note: colloquial endings

In everyday spoken Czech (obecná čeština, the common dialect of Bohemia), the hard endings are often shortened and rounded: -ý becomes -ej, and -é- becomes -ý-. So you will hear mladej for mladý, mladýho for mladého, mladýmu for mladému.

To je nějakej mladej kluk od vedle.

That's some young lad from next door. (informal / Common Czech)

These forms are completely normal in conversation but (informal) — never use them in writing, exams, or formal speech, where the standard -ý/-ého/-ému are required.

Common Mistakes

❌ Mám rád dobrý kávu.

Incorrect — káva is feminine accusative, so the adjective must agree: dobrou.

✅ Mám rád dobrou kávu.

I like good coffee.

❌ Bydlíme v nový dům.

Incorrect — the preposition v + location takes the locative; both words must inflect: v novém domě.

✅ Bydlíme v novém domě.

We live in a new house.

❌ Znáš tvůj mladý bratr?

Incorrect — a masculine animate direct object takes the accusative: mladého bratra.

✅ Znáš tvého mladého bratra?

Do you know your young brother?

❌ Pracuju s mladý kolegy.

Incorrect — s takes the instrumental plural: s mladými kolegy.

✅ Pracuju s mladými kolegy.

I work with young colleagues.

❌ To je dům staré ženy... staré muž.

Incorrect — a masculine animate genitive is starého, not staré (that's the feminine form).

✅ To je dům starého muže.

That's the old man's house.

Key Takeaways

The hard type (mladý) is the largest adjective class; learn it and you can decline most Czech adjectives.
The adjective agrees in gender, number, and case with its noun — its ending changes every time the noun's case changes.
The long vowels -ého, -ému, -ým, -ých, -ými are the fingerprint of the hard class.
The masculine accusative singular splits by animacy: animate mladého, inanimate mladý.
Colloquial speech rounds the endings to -ej / -ýho / -ýmu (informal) — recognise them, but write the standard forms.

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