artlessly       
adverb uk/ˈɑːt.ləs.li/ us/ˈɑːrt.ləs.li/
 单纯地,直率地;不诡诈地
in a way that is simple and not intended to deceive
  He is artlessly charming. 他天生迷人。 
 The actor rather artlessly described how she landed the role.  这位演员简单描述了她是如何获得这个角色的。 
 See: artless
 - More examples
- She's a wizard with numbers and also artlessly articulate.
- His architecture artlessly combines new and old without the slightest hint of irony.
- In this new book the writing seems artlessly conversational.
- No one could deflate a person or idea more artlessly and devastatingly than Mrs Roosevelt.