1. 副詞
   無庸置疑地, 毫無疑問地
   的確地, 肯定地
   

   同義字詞
   all right,alright,assuredly,certainly,clearly,definitely,doubtless,easily,hands down,inarguably,incontestably,incontrovertibly,indeed,indisputably,plainly,really,so,sure,surely,truly,unarguably,undeniably,unquestionably
   

例句

1. The charges as made were undoubtedly true.
2. These are undoubtedly aesthetic attributes.
3. Undoubtedly we could reach much further back.
4. The most famous of all was undoubtedly Careme.
5. This undoubtedly is the appeal of peer support.
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