Below are the formal and polite equivalents (synonyms) of 'promise' which you can use in your business or professional pieces of writing.

The below synonyms are used when you make a 'promise' to somebody that something will happen, that you will do something or that something you told them before is true. You would normally do this when the other person has doubts about it.

Assure

This is a formal way to say 'promise'. You often use this to talk about things which will happen or you will do in the future.

'I assure you that we will conduct an investigation into this issue as soon as possible.'


You can also use it to say that something did or didn't happen in the past or that something is happening in the present.

'I assure you that we were unaware of the problems until you contacted us.'

Guarantee

This is a strong 'promise'. It is normally only used to talk about things which will happen or you will do in the future.

'I guarantee that we will conduct an investigation into this issue as soon as possible.'


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