deutsch
German
Relates to Germany, its inhabitants, its culture, or its language.
Mein Lieblingsessen ist eine deutsche Spezialität.
My favorite food is a German specialty.

German
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German
Relates to Germany, its inhabitants, its culture, or its language.
Mein Lieblingsessen ist eine deutsche Spezialität.
My favorite food is a German specialty.

The adjective 'deutsch' (German) is the basis for other important words. These include the country 'Deutschland' (Germany) and the term for a person, 'der/die Deutsche' (the German person).
Viele Touristen besuchen Deutschland wegen der deutschen Kultur.
Many tourists visit Germany because of German culture.
As an adjective before a noun or as an adverb, 'deutsch' (German) is written with a lowercase letter. When it refers to the language as a noun, it is capitalized: 'das Deutsch' (German).
Er lernt seit einem Jahr Deutsch.
He has been learning German for a year.
The expression 'auf gut Deutsch' (in plain language) is a fixed idiom. It is used to announce that you are now going to say something very directly, honestly, and perhaps even rudely.
Auf gut Deutsch gesagt, die ganze Arbeit war umsonst.
To put it in plain language, all the work was for nothing.
direct
'deutsch' and 'direkt' are similar only in one specific idiom: 'auf gut Deutsch' means that you say something clearly and without beating around the bush. In this sense, it is similar to 'direkt'. However, 'direkt' can be used generally for open and honest statements. 'Deutsch' does not have this meaning on its own, but only in the fixed expression 'auf gut Deutsch'. Outside this expression, 'deutsch' normally refers to Germany or the German language.

Auf gut Deutsch: Wir haben für dieses Projekt zu wenig Zeit.
To put it in plain language: we don't have enough time for this project.
Herr Hoffmann ist im Gespräch sehr direkt, aber nicht unfreundlich.
Mr. Hoffmann is very direct in conversation, but not unfriendly.