- certeza
- certainty
- lo puedo afirmar con toda certeza
- I can state it with absolute certainty o in all confidence
- tengo la certeza de que …
- I'm quite sure o certain that …
- tengo la certeza de que …
- I know for sure o for certain that …
- no lo sé con certeza
- I'm not sure
- no lo sé con certeza
- I don't know for sure o with certainty