adverb
certainly
Without doubt; also used to express definite agreement.
The new lights certainly make the room brighter.
Etymology
Latin certus meant settled or sure. Certainly turns that firmness into a statement made without doubt, and in replies it conveys equally firm agreement.
More examples
- We certainly need more time to finish this project.
- “May I sit here?” “Certainly, please do.”
- The repair certainly costs less than a new refrigerator.
Forms
Similar words
- definitely
- Emphasizes a firm conclusion or commitment with no hesitation.
- undoubtedly
- Stresses lack of doubt rather than expressing direct agreement.