scruple

(noun) a unit of apothecary weight equal to 20 grains.

(noun) uneasiness about the fitness of an action. Synonyms: qualm, misgiving.

(noun) an ethical or moral principle that inhibits action.

(verb) hesitate on moral grounds. Example: "The man scrupled to perjure himself."

(verb) raise scruples. Example: "He lied and did not even scruple about it."

(verb) have doubts about.