1. 副詞
   無疑地, 毫無疑問地
   必定地
   很可能地
   大概, 多半
   

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

2. 形容詞
   無疑的
   肯定的, 確定的
   

   同義字詞
   assured,certain,clear,cocksure,confident,implicit,positive,sanguine,sure
   

例句

1. Doubtless it is the case.
2. They are doubtless expecting you.
3. Doubtless , that would stay his hand.
4. Five per cent, as you doubtless know.
5. Doubtless , Edgcote House had even more.
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