doubt (EN)
verb, noun

verb “doubt”

doubt; he doubts; past doubted, part. doubted; ger. doubting
  1. to feel unsure or not have trust in something or someone
    She doubted whether she had locked the door when she left the house.

noun “doubt”

sg. doubt, pl. doubts or uncountable
  1. the feeling of not being certain about something or a specific instance of this feeling
    Despite the evidence, he harbored doubts about his friend's innocence.