diffidently
  (ad.)無自信地;客氣地
  Dif·fi·dent·ly, adv. In a diffident manner.
     To stand diffidently against each other with their thoughts in battle array.   --Hobbes.
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  diffidently
       adv : in a diffident manner; "`Oh, well,' he shrugged diffidently,
             `I like the work.'"