Almost every Czech adjective declines — it agrees in gender, number and case with its noun, sprawling across the hard (mladý) or soft (jarní) paradigm. But a small, useful class breaks the rule entirely: a handful of borrowed words that keep one fixed shape no matter what. These are the indeclinable adjectives — mostly recent loans and a few colour terms: fér (fair), prima / super / fajn (great), bordó (maroon), khaki, lila (lilac), blond. You put them in front of any noun, in any gender, number or case, and they simply do not change. For a language that inflects almost everything, this is genuinely strange — and the strangeness cuts both ways, because the temptation is either to over-apply it (freezing adjectives that really should inflect) or to fight it (forcing endings onto loans that refuse them).
What "indeclinable" actually means
Watch bordó (maroon) stay frozen while the noun and a normal adjective beside it do all the inflecting. The noun šaty (dress/clothes — plural in form) moves through the cases; bordó never budges.
| Case | Indeclinable (bordó) | Compare: declining (červený) |
|---|---|---|
| Nom. | bordó šaty | červené šaty |
| Gen. | bez bordó šatů | bez červených šatů |
| Dat. | k bordó šatům | k červeným šatům |
| Acc. | bordó šaty | červené šaty |
| Loc. | v bordó šatech | v červených šatech |
| Instr. | s bordó šaty | s červenými šaty |
The whole right-hand column changes; the left-hand adjective is stone. That is the entire behaviour of the class.
Koupila si bordó kabát a k němu bordó kabelku.
She bought a maroon coat and a maroon handbag to go with it. (bordó unchanged before masc. kabát and fem. kabelku)
V těch khaki kalhotách ti to moc sluší.
Those khaki trousers really suit you. (khaki unchanged in the locative plural)
The everyday quality words: fér, prima, super, fajn
By far the most frequent members of this class in speech are the colloquial approval words. fér (fair, decent — from English "fair"), prima and super (great, fine), and fajn (nice, fine — from German fein / English "fine"). They sit both attributively (before a noun) and predicatively (after být, "to be"), always in one shape.
To je fér nabídka, ber ji.
That's a fair offer — take it. (attributive, fem. noun, no change)
Byl to vůči nám fér přístup.
It was a fair approach towards us. (attributive, masc.)
Ten tvůj novej šéf je fakt prima.
That new boss of yours is really great. (predicative)
Dneska je fajn počasí, pojďme ven.
The weather's nice today — let's go out. (attributive, neuter)
These belong to informal, spoken register. In formal writing you would normally swap them for a declining synonym: spravedlivá nabídka for fér nabídka, skvělý / výborný for prima / super, příjemné počasí for fajn počasí. That is a general pattern with this class — see the register note below.
The colour and fashion loans: khaki, bordó, lila, blond
Fashion and design vocabulary borrows heavily, and many of the borrowed colours never took Czech endings: khaki, bordó (maroon), lila (lilac), blond (blonde), cool and retro as descriptors, and a scattering of shade names. blond is the classic case — you say blond vlasy (blonde hair), blond holka (blonde girl), with no ending anywhere.
Má krásné blond vlasy po mámě.
She has lovely blonde hair, like her mum. (blond invariant)
Vzala si lila šálu k šedému kabátu.
She put on a lilac scarf with the grey coat. (lila frozen; šedý declines)
Chci vymalovat ložnici do khaki.
I want to paint the bedroom khaki. (khaki even as the object of 'do')
Contrast this sharply with the native colour adjectives, which decline perfectly normally as hard adjectives (the mladý type): červený (red), modrý (blue), zelený (green), žlutý (yellow), hnědý (brown). These take full endings — červená růže, do červeného auta, s modrými botami — and trying to freeze them is a real error.
Do červeného svetru se ti bude hodit modrá šála.
A blue scarf will go well with your red jumper. (červený and modrý both decline; only borrowed shades don't)
Why these resist endings — and why some have declining doublets
The reason is phonological, not arbitrary. Czech adjective endings attach to a Czech-shaped stem ending in a consonant (mlad-ý) or the soft -í (jarn-í). Loans ending in a stressed vowel (bordó, khaki, lila) or in a foreign consonant cluster (fér, blond) have nowhere to hang a -ého / -ým without mangling the word, so the language leaves them bare. Over time some loans do get "naturalised" with a native suffix and then decline like anything else — and speakers often prefer that declining doublet, especially in writing:
| Indeclinable loan | Naturalised / native equivalent (declines) |
|---|---|
| fér | férový / spravedlivý |
| super, prima | skvělý, výborný, báječný |
| fajn | příjemný, milý |
| bordó | vínově červený, purpurový |
| retro | retrový (colloq.), staromódní |
Byla to od tebe hodně férová hra.
That was a very fair game on your part. (férový — the naturalised, declining form; here fem. sg.)
So fér hra and férová hra both exist: the first is the frozen loan (punchier, more colloquial), the second the domesticated adjective (fully inflecting, a touch more standard). Knowing both lets you pick your register.
A note for English speakers
English has no declension at all, so every English adjective is, in effect, "indeclinable" — the fair offer, of the fair offer, with the fair offers, all identical. That is precisely the trap. Because staying invariant feels natural, English speakers are prone to leaving all Czech adjectives uninflected, or at least the ones that look a bit foreign. The corrective instinct to build: the invariant class is tiny and closed. Only the specific borrowed words on this page stay frozen; everything else — including all native colours and the overwhelming majority of adjectives — must agree. When in doubt, assume the adjective declines; only these named loans get a free pass.
Common Mistakes
1. Freezing a normal adjective by analogy. The single most common error: extending "no ending" from fér or khaki to a real declining adjective.
❌ Bydlíme v starý dům.
Incorrect — starý is a normal hard adjective and must decline: ve starém domě.
✅ Bydlíme ve starém domě.
We live in an old house.
2. Forcing an ending onto a genuine indeclinable. The reverse mistake — trying to make khaki or bordó agree.
❌ Koupil si khaké kalhoty.
Incorrect — khaki never inflects; it stays 'khaki kalhoty'.
✅ Koupil si khaki kalhoty.
He bought khaki trousers.
3. Declining blond. blond is invariant; the ending belongs only to the noun.
❌ Potkal jsem blondou dívku.
Incorrect — blond doesn't decline: 'blond dívku' (only the noun and any native adjective take endings).
✅ Potkal jsem blond dívku.
I met a blonde girl.
4. Using fér / prima / fajn in formal writing. They are correct but colloquial; formal texts want the declining synonyms.
❌ (ve zprávě) Soud dospěl k fér rozhodnutí.
Too colloquial for a report — use 'spravedlivému rozhodnutí'.
✅ Soud dospěl ke spravedlivému rozhodnutí.
The court reached a fair decision.
Key Takeaways
- A small, closed set of borrowed adjectives is indeclinable — one fixed form in every gender, number and case: fér, prima, super, fajn, bordó, khaki, lila, blond, retro.
- They work both attributively and predicatively unchanged; the noun (and any native adjective beside them) does all the inflecting.
- Native colours (červený, modrý, zelený) and the vast majority of adjectives decline normally — do not freeze them.
- fér/prima/super/fajn are (informal); formal writing prefers declining synonyms (spravedlivý, skvělý, příjemný). Many loans have a naturalised doublet (fér → férový).
- English speakers' default error is over-freezing: when unsure, assume the adjective declines.
Now practice Czech
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Czech→Related Topics
- Hard Adjectives: the -ý/-á/-é PatternA2 — The largest Czech adjective class — model mladý — agrees with its noun in gender, number, and case, with the long vowels -ého, -ému, -ým as its signature.
- Telling Hard and Soft Adjectives ApartA2 — A one-step test for sorting any Czech adjective into the hard (-ý/-á/-é) or soft (-í) class — read the dictionary form, and the entire case table follows.
- Adjective–Noun AgreementA2 — Every Czech adjective copies its noun's gender, number, and case — so the same adjective wears a different ending in nearly every phrase, and getting the noun right but the adjective wrong is still an error.
- Attributive vs Predicative PositionA2 — An attributive adjective sits before its noun and takes the noun's full case; a predicative adjective follows a linking verb and stands in the nominative — except after stát se, which pulls the instrumental.
- Soft Adjectives: the -í PatternA2 — The soft adjective class — model jarní — uses a single -í ending for masculine, feminine, and neuter alike, giving it far fewer distinct forms than the hard type.