Abgestandenes
Abgestandenes is a German adjective form used to describe something that has become stale, flat, or no longer fresh, especially liquids or air. It is commonly seen in phrases like abgestandenes Wasser, abgestandenes Bier or abgestandenes Brot. The form reflects the strong adjective ending used before neuter nouns in bare noun phrases, so that neuter singular examples include abgestandenes Wasser. With different nouns and articles the endings vary (for example, abgestandene Luft for feminine nouns, or abgestandener Wein for masculine nouns).
The term is most often employed for consumables and spaces where freshness matters. Water that has stood
Abgestandenes occurs as the neuter singular form in nominative or accusative position when no article accompanies
Stale, not fresh; terms describing food quality and air freshness in German.