The phrase "liable to" is often used to express the possibility or probability of something happening. There are several synonyms that can be used interchangeably with "liable to" to convey the same meaning. These include phrases such as "likely to," "prone to," "apt to," "susceptible to," "disposed to," and "vulnerable to." Using these synonyms can add variety and depth to your writing and help you avoid repetition. It's important to choose the synonym that best fits the context and tone of your writing to accurately convey your intended meaning.