scruple

scruple (http://definr.com/scruple)

     n 1: a unit of apothecary weight equal to 20 grains
     2: uneasiness about the fitness of an action [syn: qualm, misgiving]
     3: an ethical or moral principle that inhibits action
     v 1: hesitate on moral grounds; "The man scrupled to perjure
          himself"
     2: raise scruples; "He lied and did not even scruple about it"
     3: have doubts about