skep·ti·cism (US) or Brit scep·ti·cism 
/ˈskɛptəˌsɪzəm/ noun
/ˈskɛptəˌsɪzəm/ noun : an attitude of doubting the truth of something (such as a claim or statement) [noncount] ▪ She regarded the researcher's claims with skepticism. [singular] ▪ It's good to maintain a healthy skepticism about fad diets.
