Why does the noun Alptraum have the article der?

This noun follows no general suffix rule — its gender is part of the core vocabulary you simply learn alongside the word.

Declension table for German noun Alptraum

How it changes across the four cases.

CaseDefiniteIndefiniteNegative
Nominativder Alptraumein Alptraumkein Alptraum
Akkusativden Alptraumeinen Alptraumkeinen Alptraum
Dativdem Alptraumeinem Alptraumkeinem Alptraum
Genitivdes Alptraumeseines Alptraumeskeines Alptraumes

Examples in context

Real sentences using Alptraum in different cases.

CaseDefiniteIndefiniteNegative
Nominativ
Der schlimme Alptraum ist vorbei.The bad nightmare is over.
Ein seltsamer Alptraum beginnt jetzt.A strange nightmare begins now.
Kein guter Alptraum stört mich.No good nightmare bothers me.
Akkusativ
Ich hatte den gleichen Alptraum.I had the same nightmare.
Er sieht einen dunkelen Alptraum.He sees a dark nightmare.
Sie hat keinen schlimmen Alptraum.She has no bad nightmare.
Dativ
Ich leide unter dem schlimmen Alptraum.I suffer from the bad nightmare.
Er spricht über einem seltsamen Alptraum.He talks about a strange nightmare.
Ich denke an keinem guten Alptraum.I don't think about any nightmare.
Genitiv
Das Ende des schlimmen Alptraumes ist nah.The end of the bad nightmare is near.
Der Beginn eines neuen Alptraumes ist da.The beginning of a new nightmare is there.
Der Inhalt keines guten Alptraumes ist klar.The content of no good nightmare is clear.

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Frequently asked questions

Everything you might wonder about der, die, das — and the Der Artikel app.

Is it der, die, or das Alptraum?

It is der Alptraum. In German, every noun has a grammatical gender, and Alptraum is masculine. You should always learn the article together with the noun to ensure your German grammar is correct.

What is the plural of der Alptraum?

The plural form of der Alptraum is die Alpträume. In German, regardless of the singular gender, all plural nouns use the definite article “die.”

What does der Alptraum mean in English?

The German word der Alptraum translates to “nightmare” in English.

How do you decline der Alptraum?

Like all German nouns, Alptraum changes its article depending on the case. In the singular, the forms are:
  • Nominativ: der Alptraum
  • Akkusativ: den Alptraum
  • Dativ: dem Alptraum
  • Genitiv: des Alptraumes

These changes are necessary because German uses cases to indicate the noun’s role in a sentence (such as the subject or object). Knowing these forms allows you to build grammatically correct sentences.