Masculine singular adjectives in Croatian have two forms: indefinite and definite. This is similar to the difference between "a/an" and "the" in English.
Indefinite Adjectives (Short Form)
When introducing a masculine noun for the first time, use the indefinite (short) form. These usually end in a consonant.
| This is a special device for your mobile phone. | Ovo je poseban uređaj za tvoj mobitel. |
| His car has an ordinary design. | Njegov auto ima običan dizajn. |
Definite Adjectives (Long Form)
When referring to a specific or previously mentioned item—often accompanied by words like taj (that) or ovaj (this)—use the definite (long) form.
To create the definite form, add -i to the end of the indefinite masculine adjective.
Note: If the indefinite adjective ends in -an (like poseban or običan), the a is dropped before adding -i (posebni, obični).
| That special device costs too much. | Taj posebni uređaj košta previše. |
| That ordinary design is very boring. | Taj obični dizajn je jako dosadan. |
Nominative vs. Accusative
For inanimate masculine nouns (things, not people or animals), the accusative case (direct object) is identical to the nominative case (subject). The same definite and indefinite adjective rules apply whether the item is performing the action or receiving it.
Notice how koristan becomes korisni (dropping the a and t) when changing from a newly mentioned object to a specific one:
| He needs a useful accessory for the computer. | Treba mu koristan dodatak za računalo. |
| Where is that useful accessory? | Gdje je taj korisni dodatak? |
Here is another pair contrasting a new description with a specific, known item:
| Your brother has a powerful engine. | Tvoj brat ima snažan motor. |
| That powerful engine is very fast. | Taj snažni motor je jako brz. |
