ingenuous

adjectives

characterized by an inability to mask your feelings; not devious
"an ingenuous admission of responsibility"
artless, ingenuous
is derived from
ingenuousness
antonym
disingenuous
lacking in sophistication or worldliness
"a child's innocent stare"; "his ingenuous explanation that he would not have burned the church if he had not thought the bishop was in it"
ingenuous, innocent
is derived from
ingenuousness