czystej

Czystej is a grammatical form in Polish: the feminine singular inflected form of the adjective czysty, meaning clean or pure. It appears in several cases—most commonly genitive, dative, and locative—depending on the noun it modifies and the sentence structure. In everyday use, czystej describes feminine nouns such as woda (water) or intencja (intention) when discussing purity or cleanliness, either literally or metaphorically.

In practical usage, czystej can be found in phrases such as z czystej wody, meaning “from clean water” (genitive singular), or w czystej wodzie, meaning “in clean water” (locative singular). The form also appears in phrases like jakość czystej wody (“the quality of clean water”) where czystej governs the feminine singular noun wody in the genitive. The exact case used depends on the governing preposition and the noun’s role in the sentence.

Etymology and cognates: czysty derives from the Proto-Slavic root čьstъ, related to similar words in other Slavic languages, such as Czech čistý, Russian чистый (chisty), and Ukrainian чистий (chystyy). The feminine form czystej is one of several inflected variants that Polish adjectives adopt to agree with gender, number, and case. Beyond its physical sense of cleanliness, czysty and its inflections are also used metaphorically to denote moral or qualitative purity, as in czysta intencja (“pure intention”).