a moral consideration that raises a doubt or discourages an action
an uneasy feeling that arises from a doubt about the morality of something
I'd have no scruples about telling your manager what she did
a unit of weight equal to 20 grains (1.296 grams), formerly used by apothecaries
archaic a very small amount
[Middle English via French from Latin scrupulus small weight, small sharp stone, dimin. of scrupus rough pebble or, figuratively, a source or cause of mental discomfort]