doubt (EN)
verbo, substantivo

verbo “doubt”

doubt; he doubts; past doubted, part. doubted; ger. doubting
  1. dubi
    She doubted whether she had locked the door when she left the house.

substantivo “doubt”

sg. doubt, pl. doubts or uncountable
  1. dubo
    Despite the evidence, he harbored doubts about his friend's innocence.