in ‧ gen ‧ u ‧ ous /ɪnˈdʒenjuəs/ BrE AmE adjective
[ Date: 1500-1600 ; Language: Latin ; Origin: ingenuus 'born, free born, honest' , from gignere 'to produce children' ]
an ingenuous person is simple, trusting, and honest, especially because they have not had much experience of life ⇨ disingenuous
—ingenuously adverb
—ingenuousness noun [uncountable]