ingenuousness

1. Ingenuousness sometimes unconsciously penetrates deep.
   天真的话，有时不自觉地点得十分透。
2. He had said these things in a loud, rapid, hoarse voice, with a sort of irritated and savage ingenuousness.
   他大声疾呼地说完了那段话，声音粗野、强硬、嘶哑，态度急躁、鲁莽而天真。

noun

1. openly straightforward or frank

2. the quality of innocent naivete

   Synonym:    artlessnessinnocencenaturalness