Meaning

noun uneasiness about the fitness of an action

noun a mild state of nausea

originPerhaps from Middle English qualm, cwalm (“death, sickness, plague”), which is from Old English cwealm (West Saxon: "death, disaster, plague"), ūtcualm (Anglian: "utter destruction"), from Proto-West Germanic *kwalm (“killing, death, destruction”), from Proto-Indo-European *gʷelH- (“to stick, pierce; pain, injury, death”), whence also quell. Although the sense development is possible, this has…

Etymology from Wiktionary, CC BY-SA 3.0