nullifidian
noun·/ˌnʌl.ɪˈfɪd.i.ən/
A person of no faith; one who believes nothing in matters of religion or revelation. Nullifidian is categorical where agnostic might be cautious: faith counted as zero.
In their pamphlets he was branded a nullifidian, as though doubt were a crime and disbelief a contagion.
adjective
Having no faith; unbelieving (rare).
His nullifidian answers shocked the rector less than their calmness did.
Etymology
From Latin nullus “none” + fides “faith.” A word built like an accusation, with arithmetic in its bones: none, nothing, nil.
Related Words
infidelolder label for unbeliever; often hostile
atheistdenial of deity; more specific
skepticdoubter; broader and often philosophical
fiduciaryfrom the same faith-root, in a secular key