underpromise

As a noun terms

is .

As a verb underpromise is

to promise less than one expects to do.

As verbs the difference between underpromise and underpromised

is that underpromise is to promise less than one expects to do while underpromised is past tense of underpromise.

In lang=en terms the difference between promise and underpromise

is that promise is to give grounds for expectation, especially of something good while underpromise is to promise less than one expects to do.

As verbs the difference between promise and underpromise

is that promise is to commit to something or action; to make an oath; make a vow while underpromise is to promise less than one expects to do.

As a noun promise

is an oath or affirmation; a vow.