sceptically

/ˈskɛptɪkli/
adverb
  1. In a way that shows doubt or questions whether something is true or reliable.
    • The scientist listened sceptically to the claims about the new miracle cure.
    • She looked sceptically at the advertisement, wondering if the product really worked.
    • He raised an eyebrow sceptically when his friend said he had seen a ghost.
Antonyms