Learn Croatian: Djed ima sijedu kosu. - Grandpa has grey hair.

In Croatian, there is a specific adjective for grey or white hair: sijed. The word siv is the standard color grey, used for things like clothes, animals, or clouds (like sivi auto). When talking about a person's hair or beard turning grey, you always use sijed.

Is kosa considered singular or plural here?

kosa is a feminine singular noun that refers collectively to all the hair on someone's head. You don't use it in the plural to talk about a person's overall hair. If you need to talk about just one individual strand of hair, you would use a different word, like vlas or dlaka.

Why do both sijedu and kosu end in -u?

They are in the accusative case because they are the direct object receiving the action of the verb ima (has). For feminine nouns that end in -a in the dictionary (like kosa), the accusative ending becomes -u. The adjective describing it, sijeda, must match the noun's case and gender, so it also changes its ending to -u.

I often hear people say deda. Can I use that instead of djed?