certainly

/ˈsɜrtənli/
adverb
  1. Without doubt; definitely.
    • That is certainly the best movie I have seen this year.
    • He certainly knows how to cook a great meal.
    • She will certainly be at the party tonight.
  2. Used to express strong agreement or willingness.
    • "May I borrow your pen?" "Certainly, here you go."
    • "Can you help me with this?" "Certainly!"
    • "Would you like some tea?" "Certainly, thank you."
Antonyms
What does "certainly" mean? | whatsthatwordmean | whatsthatwordmean