skep·ti·cal (US) or Brit scep·ti·cal 
/ˈskɛptɪkəl/ adjective
/ˈskɛptɪkəl/ adjective [more skeptical; most skeptical] : having or expressing doubt about something (such as a claim or statement)
▪ She's highly skeptical of/about the researchers' claims. ▪ I'm skeptical that he can win. [=I doubt he can win] ▪ He says he can win, but I remain skeptical. ▪ When I said I'd finished my homework early, Mom looked skeptical.
▪ She's highly skeptical of/about the researchers' claims. ▪ I'm skeptical that he can win. [=I doubt he can win] ▪ He says he can win, but I remain skeptical. ▪ When I said I'd finished my homework early, Mom looked skeptical.
— skep·ti·cal·ly (US) or Brit scep·ti·cal·ly /ˈskɛptɪkli/ adverb
▪ People regarded the claims skeptically. ▪ She looked at me skeptically.
/ˈskɛptɪkli/ adverb ▪ People regarded the claims skeptically. ▪ She looked at me skeptically.
