Where does “koszmarny” come from?
koszmarny (Polish) comes from Polish koszmar, from French cauchemar, from Middle French cauchemare, from Old French cauquemare, from Norman cauche, from Old French chauce, from Vulgar Latin calcea, from Latin calceus — small stone, pebble; gravel, rubble.
koszmarny (Polish): nightmarish, horrible
Ancestry of “koszmarny”, step by step