Learn Croatian: Kakav nevjerojatan prizor! Opasnost je veća. - What an incredible sight! The danger is greater.

In Croatian, you use a form of kakav when you are exclaiming about a noun phrase (here, nevjerojatan prizor). Because it modifies a noun, it acts like an adjective and must agree in gender, number, and case (masculine singular nominative). You would use kako if you were exclaiming about an adjective or adverb on its own, like Kako nevjerojatno! (How incredible!).

Why is the adjective nevjerojatan used here instead of the definite form nevjerojatni?

In exclamations introducing a new observation, you are saying "What an incredible sight!" rather than "the incredible sight". Therefore, we use the indefinite form of the masculine adjective. To form this, we drop the final -i from the definite form and insert a fleeting 'a' before the last consonant to make it easier to pronounce, giving us nevjerojatan instead of nevjerojatni.

Opasnost ends in a consonant. Why does it use the feminine adjective veća?

While most Croatian nouns ending in a consonant are masculine, there is a very important group of feminine nouns that end in a consonant. The most common ones end in the suffix -ost, like opasnost (danger), radost (joy), or budućnost (future). Since opasnost is feminine, the adjective describing it must be the feminine veća.