The genitive plural is the form Czech learners dread most — and with reason. You need it constantly (after numbers from five up, after quantity words like mnoho and hodně, after most genitive prepositions), and its endings are genuinely irregular-looking. The headline fact is that for hard feminine and neuter nouns the ending is zero: you strip the nominative ending and are left with the bare stem — žena → žen, město → měst, auto → aut. The complication is that this bare stem often cannot stand as it is, so Czech inserts a vowel to break up the resulting consonant cluster — matka → matek, not matk. Master those two facts and the genitive plural stops being a mystery.
The four endings
Despite its reputation, the genitive plural uses just four endings, sorted by gender and stem hardness.
| Noun type | Gen. pl. ending | Nominative sg → Gen. pl. |
|---|---|---|
| masculine (all) | -ů | hrad → hradů, muž → mužů, pán → pánů |
| hard feminine (-a) | -∅ (zero) | žena → žen, kniha → knih |
| hard neuter (-o) | -∅ (zero) | město → měst, auto → aut |
| soft feminine / -ost | -í | růže → růží, kost → kostí, píseň → písní |
| soft neuter (-e/-í) | -í | moře → moří, stavení → stavení |
Masculine -ů: the easy case
All masculine nouns — animate and inanimate, hard and soft — take -ů in the genitive plural. There is no zero ending and no vowel insertion to worry about here; you simply add -ů to the stem.
V parku bylo plno psů.
The park was full of dogs. (pes → genitive plural psů — note the dropped -e-, see below)
Pozvali jsme pět kamarádů.
We invited five friends. (kamarád → kamarádů, after the number pět)
Ve městě je hodně obchodů.
There are a lot of shops in town. (obchod → obchodů, after hodně)
One wrinkle: a few masculines have a long root vowel that shortens when the -ů is added, most famously dům → domů ("of houses"). The vowel -ů in the ending is long; the root vowel goes short.
V té ulici je řada starých domů.
There's a row of old houses on that street. (dům → domů, root shortened)
The zero ending: bare-stem feminines and neuters
Here is the form that surprises everyone. Hard feminine nouns in -a and hard neuter nouns in -o lose their ending entirely in the genitive plural. What remains is the bare stem — and Czech, unlike English, is perfectly happy to end a word in a cluster of consonants.
| Nominative sg | Genitive pl | Meaning |
|---|---|---|
| žena | žen | of women |
| kniha | knih | of books |
| ryba | ryb | of fish |
| město | měst | of towns |
| auto | aut | of cars |
| slovo | slov | of words |
V naší firmě pracuje hodně žen.
A lot of women work at our company. (žena → genitive plural žen)
Navštívili jsme pět měst za jeden týden.
We visited five towns in one week. (město → měst, after pět)
Na parkovišti bylo plno aut.
The car park was full of cars. (auto → aut)
The inserted vowel: matka → matek
Now the part that makes the zero ending hard. When stripping the ending would leave an awkward consonant cluster at the end of the word, Czech slips a fill vowel between the last two consonants. This vowel is almost always -e- (sometimes -ě- after a soft consonant), and it is predictable, not random: clusters get a vowel to break them up.
| Nominative sg | Bare stem (impossible) | Gen. pl. with fill vowel | Meaning |
|---|---|---|---|
| matka | *matk | matek | of mothers |
| sestra | *sestr | sester | of sisters |
| okno | *okn | oken | of windows |
| hra | *hr | her | of games |
| písmeno | *písmn | písmen | of letters |
| dívka | *dívk | dívek | of girls |
| kniha | knih (no insert) | knih | of books (cluster -hn- is fine) |
Notice the pattern: the fill vowel goes before the final consonant of the cluster (mat-e-k, sest-e-r, ok-e-n). Note too that kniha → knih needs no insertion — the cluster -hn- is not what gets broken; rather it is clusters like -tk-, -str-, -kn-, -vk- that trigger the vowel. The rule of thumb: if the bare stem ends in two consonants the language won't tolerate, expect an inserted -e-.
Sešlo se tu pět matek s dětmi.
Five mothers with children gathered here. (matka → matek, inserted -e-)
Mám tři sestry, ale dnes přijde jen pár sester.
I have three sisters, but only a couple of sisters are coming today. (sestra → sester)
V tom pokoji je šest oken.
There are six windows in that room. (okno → oken, inserted -e-)
Zahráli jsme si pár her.
We played a few games. (hra → her — the cluster needs the vowel)
The same vowel-insertion happens in the masculine -ů type when the stem would otherwise end in a hard cluster, though it is less common there: pes → psů actually drops its fugitive -e- (the -e- of pes was itself a fill vowel that vanishes once an ending is added). This "fleeting -e-" works in both directions — inserted before zero endings, deleted before vowel endings.
Soft -í and the kost / píseň types
Soft-stem feminines (the růže type), the -ost abstract nouns (the kost type), the píseň-type feminines, and soft neuters all take -í in the genitive plural. No zero, no vowel insertion — just add -í.
| Nominative sg | Genitive pl | Meaning |
|---|---|---|
| růže | růží | of roses |
| kost | kostí | of bones |
| píseň | písní | of songs |
| moře | moří | of seas |
| místnost | místností | of rooms |
Koupila kytici z deseti růží.
She bought a bouquet of ten roses. (růže → genitive plural růží)
Zná spoustu lidových písní.
She knows lots of folk songs. (píseň → písní, after spoustu)
Common Mistakes
❌ Pracuje tu pět ženy.
Wrong — after 'pět' you need the genitive plural; the hard feminine takes the zero ending.
✅ Pracuje tu pět žen.
Five women work here. (žena → žen)
❌ Sešlo se tu pět matk.
Impossible cluster — the bare stem -tk needs an inserted -e-.
✅ Sešlo se tu pět matek.
Five mothers gathered here. (matka → matek)
❌ V pokoji je šest okn.
Wrong — the cluster -kn must be broken by a fill vowel: oken.
✅ V pokoji je šest oken.
There are six windows in the room. (okno → oken)
❌ Ve městě je hodně obchodu.
Wrong vowel length — the masculine genitive plural ending is long -ů, not short -u (that's the singular).
✅ Ve městě je hodně obchodů.
There are a lot of shops in town. (obchod → obchodů)
❌ Koupila kytici z deseti růž.
Wrong — soft feminines take -í, not the zero ending: růží.
✅ Koupila kytici z deseti růží.
She bought a bouquet of ten roses. (růže → růží)
Key Takeaways
- Four endings: masculine -ů (hradů, mužů), hard feminine/neuter zero (žen, měst, aut), soft feminine/neuter and -ost -í (růží, kostí, písní).
- The zero ending leaves the bare stem — it is the plural, not a fragment: žen, měst, slov.
- When the bare stem would end in an awkward cluster, Czech inserts -e- (or -ě-) before the last consonant: matka → matek, okno → oken, sestra → sester, hra → her.
- The masculine -ů is long; a long root vowel may shorten before it (dům → domů), and a fugitive -e- may drop (pes → psů).
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
- The Genitive After Quantity WordsA2 — How indefinite quantity words like mnoho, málo and trochu force the counted noun into the genitive.
- The Partitive GenitiveA2 — Why a container, measure or portion forces the substance it holds into the genitive — sklenice vody, kilo masa, šálek kávy — with no word for 'of'.
- Genitive Plural Noun Forms Used After NumbersA2 — How to actually build the genitive plural — mužů, žen, oken, sester, lidí, let — that every number from five up demands.
- Feminine: The Žena ParadigmA1 — The hard feminine pattern žena (woman) — the model for the huge class of feminine nouns ending in -a, with its full seven-case table for both numbers.
- Neuter: The Město ParadigmA2 — The hard neuter pattern město (town/city) — the model for neuter nouns ending in -o, with its full seven-case table, the zero genitive plural, and the fill vowel.
- The Genitive in Comparisons and Set PhrasesB1 — The residual genitive uses: plný + genitive (full of), quantifying nouns like řada/spousta, adjectives that govern the genitive, and frozen adverbial genitives like jednoho dne.