svartis

Noun

 * 1) black ice, a thin barely visible layer of ice on roads and pavements
 * 2) congelation ice that looks black due to transparency
 * 1) congelation ice that looks black due to transparency

Etymology 2
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Adjective

 * 1)  (romantically) jealous

Declension

 * Invariable, only used predicatively.
 * Usually of romantic jealousy (like being (overly) worried about infidelity). More rarely of other kinds of jealousy that involve less attention being given towards oneself.