Qualm is a noun but can also be used as an adjective, qualmy.
Qulam entered the lexicon around the 1500’s, but the current etymology is unknown. The word qualm may be derived from the Old English word cwealm (death, disaster), the Proto-West Germanic word kwalm (death), or the German word qualm (daze), but there is no consensus among scholars.
The definition of qualm has evolved over time. In the book, Dr Jekyl and Mr. Hyde by Robert Louis Stevenson, the word qualm was defined as a sudden attack of illness. However, the definition of qualm morphed and in Washinton Irving’s The Sketch Book the word is used to describe a sudden feeling of usually disturbing emotion. In addition, the definition of qualm has continued to take on new meaning, and today it’s defined as a feeling of uneasiness taken on by one’s own judgement.
Thao had major qualms before entering the cemetery at night.