Another surprise:
qualm
n.
5ME qualme < OE cwealm, death, disaster (akin to Ger qual, pain, Swed kvalm, nausea) < base of cwellan, to kill (see QUELL): all extant senses show melioration of the orig. meaning6
1 a sudden, brief feeling of sickness, faintness, or nausea
2 a sudden feeling of uneasiness or doubt; misgiving
3 a twinge of conscience; scruple
SYN.—qualm implies a painful feeling of uneasiness arising from a consciousness that one is or may be acting wrongly [he had qualms about having cheated on the test]; scruple implies doubt or hesitation arising from difficulty in deciding what is right, proper, just, etc. [to break a promise without scruple]; compunction implies a twinge of conscience for wrongdoing, now often for a slight offense [to have no compunctions about telling a white lie]; misgiving implies a disturbed state of mind resulting from a loss of confidence as to whether one is doing what is right [misgivings of conscience]

Now I shall have qualms about using the word.