"skeptical" in the adjective sense
1. disbelieving, skeptical, sceptical, unbelieving
denying or questioning the tenets of especially a religion
"a skeptical approach to the nature of miracles"
2. doubting, questioning, skeptical, sceptical
marked by or given to doubt
"a skeptical attitude"
"a skeptical listener"
Source: WordNet® (An amazing lexical database of English)
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