"unbelieving" in the adjective sense
1. atheistic, atheistical, unbelieving
rejecting any belief in gods
2. nescient, unbelieving
holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible
3. 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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