queasy adj.

mid-15c., kyse, coysy, of food, "unsettling to the stomach, apt to cause nausea;" by 1540s of persons or the stomach, "affected with nausea, inclined to vomit;" a word of uncertain origin, possibly from a Scandinavian source, such as Old Norse kveisa "a boil" (Middle English Compendium compares Old Norse iðra-kveisa "bowel pains"). Or perhaps from or influenced by Anglo-French queisier, from Old French coisier "to wound, hurt, make uneasy," which seems to be from the same Germanic root as kveisa. But the history is obscure and evidences of development are wanting. Related: Queasily; queasiness.