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doubt (EN)
sögn, Nafnorð

sögn “doubt”

nafnháttur doubt; hann doubts; þátíð doubted; lh. þt. doubted; nhm. doubting
  1. efast
    She doubted whether she had locked the door when she left the house.

Nafnorð “doubt”

eintala doubt, fleirtala doubts eða óteljanlegt
  1. efi
    Despite the evidence, he harbored doubts about his friend's innocence.