1. [ adjective ] holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible
Synonyms: nescient
Related terms: agnostic
2. [ adjective ] (religion) rejecting any belief in gods
Synonyms: atheistic atheistical
Related terms: irreligious
3. [ adjective ] (religion) denying or questioning the tenets of especially a religion
Synonyms: skeptical sceptical disbelieving

"a skeptical approach to the nature of miracles"

Related terms: incredulous
Similar spelling:   unbelievingly