qualm 
/ˈkwɑ:m/ noun
plural qualms /ˈkwɑ:m/ noun [count] : a feeling of doubt or uncertainty about whether you are doing the right thing
▪ He accepted their offer without a qualm. — usually plural — often + about ▪ She had/felt some qualms about moving to the big city. ▪ He had no qualms about accepting their offer.
▪ He accepted their offer without a qualm. — usually plural — often + about ▪ She had/felt some qualms about moving to the big city. ▪ He had no qualms about accepting their offer.
