Qualms

noun

1. A feeling of apprehension, doubt, fear etc.
2. A sudden sickly feeling; queasiness.
3. A prick of the conscience; a moral scruple, a pang of guilt. (Now often in negative constructions.)

   "This lawyer has no qualms about saving people who are on the wrong side of the law."

4. Mortality; plague; pestilence.
5. A calamity or disaster.