Adjectives ending in vowels

Regular Danish adjectives add -t for neuter nouns and -e for plural and definite nouns. However, adjectives that end in a vowel often break these rules.

Adjectives Ending in -u

Adjectives ending in -u—such as ru (rough), snu (sly), or ædru (sober)—are completely uninflected. They never change regardless of the noun's gender or number.

The silk has a soft surface, but the board is rough.
Silken har en blød overflade, men brættet er ru.
The driver is fortunately completely sober.
Chaufføren er heldigvis helt ædru.

Adjectives Ending in -å

Adjectives ending in -å, like rå (raw), add a -t for neuter nouns, but do not take an -e in the plural or definite forms.

She eats a raw onion.
Hun spiser et råt løg.
The chef cuts the raw meat.
Kokken skærer det rå kød.
Are the tomatoes raw, or are they soft?
Er tomaterne rå, eller er de bløde?

Other Uninflected Vowels (-y, -o, -e)

Like adjectives ending in -u, adjectives ending in -y (sky), -o (tro), or an unstressed -e (øde, ringe) never change. They keep their base form for all genders, plurals, and definite forms.

The fox is a sly animal, but it is also very shy.
Ræven er et snu dyr, men den er også meget sky.
The shy animals live on a deserted island.
De sky dyr lever på en øde ø.
I think that the quality is poor, but I am a loyal customer.
Jeg synes at kvaliteten er ringe, men jeg er en tro kunde.