I guarantee

Definitions

A formal promise or assurance that a specific condition will be fulfilled or a result will be achieved.

An expression used to emphasize the speaker's absolute certainty regarding the truth or occurrence of a statement.

Examples

I guarantee that you will be satisfied with the quality of our service.

I guarantee that I will finish the report before the deadline tomorrow.

I guarantee that this is the best price you will find in the entire city.

Synonyms

I promise I assure you I vow I swear I pledge I commit I certify

Antonyms

I doubt I deny I disclaim I hesitate I speculate I guess I renounce