doubtlessly

/ˈdaʊtləsli/
adverb
  1. In a way that is without doubt; certainly.
    • She doubtlessly knew the answer but chose not to speak.
    • The discovery will doubtlessly change how we understand history.
    • The team will doubtlessly celebrate their victory tonight.
Antonyms
What does "doubtlessly" mean? | whatsthatwordmean | whatsthatwordmean