English
incredulousness
From incredulous + -ness.
A compound of incredulous + -ness
Proto-Indo-European *ḱérddʰeh₁ti
…
Proto-Italic *krezðō ‘to believe’
Latin crēdō ‘to believe’
Latin crēdulus ‘that easily believes a thing, easy of belief’
Latin incrēdulus ‘unbelieving’
English incredulous
Today it means
noun Incredulity; the state of being skeptical or in disbelief
Language periods are conventional ranges, not dates for this word.
Etymograph / incredulousness