German adjectives provide more information about something or someone, an occurrence or a condition. They often describe nouns and personal pronouns. Some adjectives can directly govern the grammatical case of the nouns or pronouns that follow them.

Accusative adjectives
Adjectives that describe size and length require the accusative.

There are other adjectives that govern the accusative case, too.

Dative adjectives
You already also know some adjectives that require the dative case.

Genitive adjectives
There are also adjectives that require the genitive. Some of them precede a genitive object.

Sometimes, especially in colloquial speech, the inflected form "voller" is used instead of "voll". "voller" is the genitive plural form.

Adjectives with the genitive are often substituted by other constructions using a preposition + the dative.