Usage Note
Polonais as an adjective means Polish (relating to Poland). As a noun, un Polonais / une Polonaise means a Polish person, and le polonais is the Polish language. Note that nationalities as nouns are capitalised in French (un Polonais), but as adjectives they are lowercase (la culture polonaise).
Examples
"Il parle couramment le polonais."
Natural Translation
He speaks Polish fluently.

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