Questions & Answers about Der Nebel ist heute sehr dicht.
In this sentence, dicht means thick / dense, describing how hard it is to see through the fog.
Common meanings of dicht:
- dense / thick (fog, smoke, forest): Der Nebel ist dicht.
- tight / not leaky (window, bottle): Die Fenster sind nicht dicht.
- close together (people, houses): Die Häuser stehen dicht beieinander.
So here it’s specifically dense / thick in the sense of visibility.
Nebel is a masculine noun in German, so in the nominative singular it takes the article der: der Nebel.
Basic forms:
- Nominative singular: der Nebel
- Accusative singular: den Nebel
- Dative singular: dem Nebel
- Genitive singular: des Nebels
There is a plural: die Nebel, but it’s not very common in everyday weather talk. Most of the time you talk about fog in general using the singular.