secretively       
adverb  mainly disapproving uk/ˈsiː.krə.tɪv.li/ us/ˈsiː.krə.t̬ɪv.li/
 隐秘地,秘密地
in a way that hides your feelings, thoughts, intentions, or actions from other people
  They denied meeting secretively.
 She smiled secretively. 她暗自地笑了。 
 See: secretive
 - More examples
 - He spread his hands secretively over the page.
 - Chocolate was passed secretively around the group.
 - She spoke softly, but not secretively.