ingenuous/ɪnˈdʒenjuəs; ɪn`dʒɛnjʊəs/ adj(fml 文) not attempting to deceive or conceal; open; innocent 不欺骗的; 不隐瞒的; 坦率的; 天真无邪的 an ingenuous smile纯真的微笑.
牛津英汉双解词典