Advanced level expressions to use in your speaking (C1)
Use "needless to say" in a sentence
as you would expect; added to, or used to introduce, a remark giving information that is expected and not surprising:
Use "to say the least" in a sentence
used to show that what you are describing is in fact much more serious or important than you have suggested:
Use "it's safe to say" in a sentence
used to say that you are confident about what you are going to say: