Adjective Declension: Hard Stems | Croatian Grammar

This is the master paradigm for regular Croatian adjectives — the full grid of seven cases across three genders, singular and plural, shown on nov ("new") with dobar / dobri ("good") alongside. We lay out the definite (long) endings as the primary system, because those are what modern Croatian uses for almost everything (see definite vs indefinite), and then add the surviving indefinite oblique forms as a secondary set. The single most efficient insight here: adjective endings are pronominal — they pattern with the demonstratives taj / ovaj / onaj, not with nouns — so learning these endings teaches you the demonstratives at the same time.

Singular: the definite paradigm

Case	Masculine	Neuter	Feminine
Nominativ	novi	novo	nova
Genitiv	novog(a)	novog(a)	nove
Dativ	novom(u)	novom(u)	novoj
Akuzativ	novi / novog(a)	novo	novu
Vokativ	novi	novo	nova
Lokativ	novom(e)	novom(e)	novoj
Instrumental	novim	novim	novom

A few things to read off this grid immediately. Masculine and neuter share every oblique case (genitive, dative, locative, instrumental are identical); they differ only in the nominative/accusative (novi/novo). The masculine accusative splits by animacy, exactly like nouns: inanimate copies the nominative (novi), animate copies the genitive (novog). The feminine has its own neat set — nova, nove, novoj, novu, novom — with dative and locative collapsing into novoj.

Kupili smo novi auto.

We bought a new car. — masculine inanimate accusative copies the nominative: novi.

Upoznao sam novog kolegu.

I met a new colleague. — masculine animate accusative copies the genitive: novog.

Boja novog auta mi se sviđa.

I like the colour of the new car. — genitive 'novog' agreeing with genitive noun 'auta'.

Vozimo se u novom autu.

We're riding in the new car. — locative 'novom' after the locative noun 'autu'.

Idem novom kolegi pomoći.

I'm going to help the new colleague. — dative 'novom'.

The feminine in action

To je nova prilika.

That's a new opportunity. — feminine nominative 'nova'.

Bojim se nove odgovornosti.

I'm afraid of the new responsibility. — feminine genitive 'nove'.

Veselim se novoj godini.

I'm looking forward to the new year. — feminine dative 'novoj'.

Putujem novom prijateljicom u Split.

I'm travelling to Split with a new friend (f). — feminine instrumental 'novom'.

The optional -a / -u extensions

You will have noticed the parentheses: novog(a), novom(u), novom(e). The masculine/neuter genitive and dative/locative singular each have a longer variant with an extra final vowel:

Genitive: novog ↔ novoga
Dative: novom ↔ novomu
Locative: novom ↔ novome

These are stylistic length variants, not different cases. The longer forms feel slightly more formal, rhythmic, or literary, and are often used to avoid two short clitic-like words colliding or simply for cadence; the shorter forms dominate everyday speech. Both are fully standard — choose by ear and register.

Sjećam se onoga ljeta.

I remember that summer. — the longer 'onoga' (vs 'onog') reads a touch more formal/rhythmic.

Dao sam ključ novome susjedu.

I gave the key to the new neighbour. — the longer dative 'novome' (vs 'novom'); both are correct.

💡

The final -a/-u/-e on novoga, novomu, novome is a length switch, not a meaning switch. Default to the short forms (novog, novom) in speech; reach for the long ones in formal writing or where they read more smoothly.

Plural: the definite paradigm

Case	Masculine	Neuter	Feminine
Nominativ	novi	nova	nove
Genitiv	novih	novih	novih
Dativ	novim(a)	novim(a)	novim(a)
Akuzativ	nove	nova	nove
Vokativ	novi	nova	nove
Lokativ	novim(a)	novim(a)	novim(a)
Instrumental	novim(a)	novim(a)	novim(a)

The plural is where the genders merge. The genitive is novih for all three; the dative, locative, and instrumental are all novim(a) for all three — a sweeping syncretism that mirrors the noun plural (-ima) and makes the plural far less work than the singular. Genders stay distinct only in the nominative/accusative/vocative (novi / nova / nove). The dat/loc/instr plural also has the optional final -a (novim ↔ novima), the same length variation as the singular.

Stigli su novi studenti.

The new students have arrived. — masculine nominative plural 'novi'.

Govorimo o novim pravilima.

We're talking about the new rules. — neuter locative plural 'novim' (with neuter noun 'pravilima').

Treba pomoći novim učenicama.

The new pupils (f) need help. — feminine dative plural 'novim(a)'.

Ima puno novih mogućnosti.

There are lots of new possibilities. — genitive plural 'novih', shared by all genders.

Adjective endings are pronominal — learn them with the demonstratives

Now the payoff promised at the top. Croatian adjective endings do not copy noun endings; they copy the pronominal declension — the pattern of demonstratives like taj ("that") and ovaj ("this"). Compare:

Case (masc sg)	Demonstrative	Adjective
Nominativ	taj	novi
Genitiv	tog(a)	novog(a)
Dativ	tom(u)	novom(u)
Instrumental	tim	novim

The shared signatures jump out: genitive -og, dative/locative -om, instrumental -im, plural genitive -ih, plural dat/loc/instr -im(a). The demonstrative and the adjective march in step through the whole declension. This is why a phrase like tom novom prijatelju (dative) has both words ending the same way — they belong to one paradigm. Study the demonstratives and the hard adjective endings as one thing and you have learned both for the price of one. The demonstrative grid is on demonstrative declension.

Vjerujem tom novom liječniku.

I trust that new doctor. — dative throughout: 'tom novom' share the -om ending.

Razgovarali smo s tim novim susjedima.

We talked with those new neighbours. — instrumental plural: 'tim novim' both end in -im.

A noun phrase fully declined

To see the whole machine running, here is novi auto ("the new car", masculine inanimate) pushed through the singular:

Case	Phrase
Nominativ	novi auto
Genitiv	novog auta
Dativ	novom autu
Akuzativ	novi auto
Lokativ	novom autu
Instrumental	novim autom

Notice the adjective and noun do not wear identical endings (adjective novog, noun auta) — the adjective takes pronominal endings, the noun its own — yet they stay in perfect agreement of case. That is the relationship to internalise.

Common mistakes

❌ Boja novoga auta.

Not wrong, just over-formal in speech — prefer the short 'novog'; reserve 'novoga' for formal writing.

✅ Boja novog auta.

The colour of the new car. — short genitive 'novog' is the everyday choice.

❌ Upoznao sam novi kolegu.

Incorrect — 'kolega' is animate, so the masculine accusative must copy the genitive: novog.

✅ Upoznao sam novog kolegu.

I met a new colleague. — animate accusative 'novog'.

❌ Govorimo o novih pravilima.

Incorrect — after a locative noun you need the locative/instrumental plural 'novim', not the genitive 'novih'.

✅ Govorimo o novim pravilima.

We're talking about the new rules. — locative plural 'novim'.

❌ Vjerujem tom novog liječniku.

Incorrect — both modifiers are dative; the adjective must be 'novom', matching 'tom', not the genitive 'novog'.

✅ Vjerujem tom novom liječniku.

I trust that new doctor. — dative 'tom novom'.

❌ Putujem novom prijateljom.

Incorrect — the feminine instrumental of the noun is 'prijateljicom'; the adjective 'novom' is right, but watch the noun.

✅ Putujem novom prijateljicom.

I'm travelling with a new friend (f). — feminine instrumental, adjective and noun both -om.

Key takeaways

The hard-stem definite paradigm is the working system: masc/neut novi/novo, novog(a), novom(u), novim; fem nova, nove, novoj, novu, novom; plural genders merge in novih (gen) and novim(a) (dat/loc/instr).
Masculine = neuter in all oblique singular cases; they split only in nom/acc. The masculine accusative obeys animacy (inanimate = nom, animate = gen).
The optional final -a/-u/-e (novoga, novomu, novome; novima) is a length/register variant, not a separate case.
The plural shows heavy syncretism: one genitive (novih) and one dat/loc/instr (novim(a)) for all genders.
Adjective endings are pronominal — they share -og, -om, -im, -ih with the demonstratives taj/ovaj/onaj, so learn the two together.

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