Definition of "Scruple" :

noun: an ethical or moral principle that inhibits action

noun: uneasiness about the fitness of an action

noun: a unit of apothecary weight equal to 20 grains

verb: have doubts about

verb: raise scruples

"He lied and did not even scruple about it."

verb: hesitate on moral grounds

"The man scrupled to perjure himself."