unaffectedly       
adverb  approving uk/ˌʌn.əˈfek.tɪd.li/ us/ˌʌn.əˈfek.tɪd.li/
 真诚自然地;不矫揉造作地;真挚地
in a way that is natural and sincere
  They are both tremendously, unaffectedly nice people, who have become great friends. 他们都是不折不扣的好人,成了很好的朋友。 
 He is most unaffectedly modest. 他的谦虚是最真挚的。 
 See: unaffected
 - More examples
 - She spoke so unaffectedly that he was sure in his heart that his father could not object to her.
 - Her sense of loss is unaffectedly genuine.
 - She spoke touchingly and unaffectedly about her faith.