NESCIENT

ignorant, nescient, unlearned, unlettered

(adjective) uneducated in general; lacking knowledge or sophistication; “an ignorant man”; “nescient of contemporary literature”; “an unlearned group incapable of understanding complex issues”; “exhibiting contempt for his unlettered companions”

nescient, unbelieving

(adjective) holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible

Source: WordNet® 3.1

Noun

nescient (plural nescients)

An ignorant person.

One who holds that only material phenomena can be known and knowledge of spiritual matters (the unmeasurable) or ultimate causes is impossible.

Adjective

nescient (comparative more nescient, superlative most nescient)

ignorant, unlearned

unbelieving

Source: Wiktionary