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