ingenuousness

nouns

the quality of innocent naivete
artlessness, ingenuousness, innocence, naturalness
is derived from
ingenuous
openly straightforward or frank
ingenuousness
is derived from
ingenuous
antonym
disingenuousness
is a type of (narrower)
the quality of being honest and straightforward in attitude and speech
candidness, candor, candour, directness, forthrightness, frankness