The word "unexpected" is commonly used to describe events or situations that occur without warning or preparation. Synonyms for this word include surprising, unforeseen, abrupt, sudden, unanticipated, and astonishing. Other words like unpredictable, astonishing, jarring, and startling can also be used interchangeably in some contexts. When looking for synonyms to replace "unexpected," it's important to consider the shade of meaning that best suits the context. Some synonyms can indicate a greater degree of suddenness or surprise, while others may suggest an element of shock or awe. By using synonyms, you can add variety and depth to your writing, making it more compelling and engaging for your audience.