The rat had no morals, no conscience, no scruples, no consideration, no decency, no milk of rodent kindness, no compunctions, no higher feeling, no friendliness, no anything - E.B. White
There's nothing to winning, really. That is, if you happen to be blessed with a keen eye, an agile mind, and no scruples whatsoever. - Alfred Hitchcock
Men are not so weak as you think. They can always leave anybody or any place without a pang - if they find another person or another place they like better. If they feel pricks and scruples it is merely because they cannot make up their mind that the change will be absolutely to their advantage.
He without benefit of scruples His fun and money soon quadruples. - Ogden Nash
We live in a wondrous time, in which the strong is weak because of his scruples and the weak grows strong because of his audacity. - Otto von Bismarck