Noah Webster's New International Dictionary of the English Language

1. (a.) Careful; conscientious; moral; as, a scrupulous performance of duties.

2. (a.) Full of scruples; inclined to scruple; nicely doubtful; hesitating to determine or to act, from a fear of offending or of doing wrong.

3. (a.) Given to making objections; captious.

4. (a.) Liable to be doubted; doubtful; nice.