doubtlessness

/ˈdaʊtləsnəs/
noun
  1. The state or quality of being without doubt; certainty.
    • The doubtlessness of her testimony convinced the jury.
    • There was a sense of doubtlessness in the team's final decision.
    • His confidence came from the doubtlessness of his scientific proof.
Antonyms
What does "doubtlessness" mean? | whatsthatwordmean | whatsthatwordmean