When expressing certainty or a strong likelihood that something will happen, there are several synonyms for the phrase "sure to." Some options include "bound to," "destined to," "guaranteed to," "certain to," "likely to," and "inevitable." Each of these phrases communicate a high degree of confidence in the outcome of a situation. "Bound to" and "destined to" suggest a pre-determined fate, while "guaranteed to" emphasizes a promise or assurance. "Certain to" and "likely to" indicate a high probability, and "inevitable" implies that the outcome is unavoidable. Choosing the right synonym can add nuance and emphasis to your language, allowing you to effectively convey your level of certainty.