skeptical

Adjective Satellite

• denying or questioning the tenets of especially a religion
  • "a skeptical approach to the nature of miracles"
• marked by or given to doubt
  • "a skeptical attitude"
  • "a skeptical listener"

Adj

• Having, or expressing doubt; questioning.
• Of or relating to philosophical skepticism or the skeptics.

Examples

• I can see why people are so skeptical [sic] about him, but I think he's on to something here.
• My teacher was skeptical when I told her my dog ate my homework.
• Tom was skeptical when Paul told him that he saw Bigfoot.

Synonyms

disbelieving, doubting, questioning, sceptical, unbelieving