ingenuous
adjective /ɪnˈdʒenjuəs/
/ɪnˈdʒenjuəs/
(formal, sometimes disapproving)- honest, innocent and willing to trust people
单纯的；天真的 - You're too ingenuous.
你太老实了。 - an ingenuous smile
纯真的微笑 - It is ingenuous to suppose that money did not play a part in his decision.
如果以为他的决定没有金钱的因素，那就太天真了。
词源late 16th cent.: from Latin ingenuus literally ‘native, inborn’, from in- ‘into’ + an element related to gignere ‘beget’. The original sense was ‘noble, generous’, giving rise to ‘honourably straightforward, frank’, hence ‘innocently frank’ (late 17th cent.). - You're too ingenuous.