Simple Examples:
* The trip was delayed due to an unforeseen mechanical problem with the plane.
* The sudden storm caused unforeseen power outages across the city.
* We had to adjust our plans because of unforeseen circumstances.
More Complex Examples:
* Despite meticulous planning, unforeseen complications arose during the construction project, delaying its completion.
* The company's financial performance suffered due to unforeseen market fluctuations.
* The research team encountered unforeseen challenges while conducting their experiments in the remote jungle.
Examples with Emphasis:
* The completely unforeseen flood devastated the entire town.
* The sudden, totally unforeseen change in policy left many people confused.
* The unforeseen, yet unavoidable, consequences of the decision were significant.
Remember, "unforeseen" implies something that was not anticipated or planned for.