thüringisch
Thuringian
Relating to the German federal state of Thuringia, its inhabitants, or their dialect.
Ihr thüringischer Akzent war kaum zu überhören.
Her Thuringian accent was hard to miss.

Thuringian
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Thuringian
Relating to the German federal state of Thuringia, its inhabitants, or their dialect.
Ihr thüringischer Akzent war kaum zu überhören.
Her Thuringian accent was hard to miss.

The adjective 'thüringisch' (Thuringian) is derived from the name of the federal state 'Thüringen' (Thuringia). The ending '-isch' is a very common way to form adjectives from geographical names.
Die thüringische Landschaft ist bekannt für ihre Wälder.
The Thuringian landscape is known for its forests.
'Thüringisch' (Thuringian) is a normal adjective and is declined when it comes before a noun. Its ending adapts to the gender, case, and number of the noun.
Wir haben eine typisch thüringische Bratwurst gegessen.
We ate a typical Thuringian bratwurst.
When the word describes how someone speaks (that is, refers to the dialect), it is used as an adverb and written in lowercase. In this form, it remains unchanged.
Mein Großvater spricht noch echtes Thüringisch.
My grandfather still speaks real Thuringian dialect.
Thuringian
'thüringer' and 'thüringisch' both refer to Thuringia. 'thüringer' often comes directly before fixed terms, especially for origin or affiliation, for example with products, places, or people. It is not declined. 'thüringisch' is more flexible and can also describe the dialect, the style, or generally something typical of Thuringia. The words can be confused because both can mean 'from Thuringia'. In practice: with fixed names, 'thüringer' often sounds natural; for language, style, or general description, 'thüringisch' is more likely.

Herr Becker spricht mit seinen Eltern oft thüringisch.
Mr. Becker often speaks Thuringian with his parents.
Am Wochenende kaufen wir thüringer Bratwurst für den Grillabend.
At the weekend, we are buying Thuringian bratwurst for the barbecue.