
Polnisch
Polish
The West Slavic language spoken in Poland.
Mein Kollege spricht fließend Polnisch.
My colleague speaks fluent Polish.
Polish
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Polish
The West Slavic language spoken in Poland.
Mein Kollege spricht fließend Polnisch.
My colleague speaks fluent Polish.
'Polnisch' (Polish) is the name of the language. It is a nominalized adjective and is therefore always capitalized.
Sie lernt seit einem Jahr Polnisch.
She has been learning Polish for a year.
When 'Polnisch' (Polish) is used as the name of the language with verbs like 'sprechen' (to speak), 'lernen' (to learn), or 'verstehen' (to understand), it normally appears without an article.
Kannst du Polnisch verstehen?
Can you understand Polish?
Common constructions are 'auf Polnisch' (in Polish, to describe the language of a medium) and 'aus dem Polnischen' (from Polish, when translating).
Der Brief war auf Polnisch geschrieben.
The letter was written in Polish.
Polish
Polnisch and das Polnisch both refer to the language of Poland. Polnisch is used as an adjective with a noun or can describe an action more precisely, whereas das Polnisch is the nominalized name of the language, stands on its own, and is capitalized. Use Polnisch when you mean the language as an object of discussion.

Das Polnisch meiner Nachbarin klingt sehr flüssig.
My neighbor's Polish sounds very fluent.
Die polnische Sprache klingt für viele Lernende zunächst ungewohnt.
The Polish language initially sounds unfamiliar to many learners.