Which word best describes an event that is a fortunate accident?

The word "serendipitous" perfectly captures the essence of a fortunate accident because it refers to a surprising and unexpected discovery that leads to a positive outcome. This term is often used to describe situations where something beneficial occurs unexpectedly, often through a combination of chance and luck. The nature of serendipity implies that the event was not planned or foreseen, making it synonymous with fortunate accidents.

The other terms do not convey the same meaning. "Foreboding" implies a sense of dread or an ominous feeling about the future, which is opposite to the idea of a fortunate event. "Intentional" suggests that an action is done on purpose, which conflicts with the concept of an unexpected accident. "Oblivious" refers to being unaware or uninformed, which does not encapsulate the notion of something fortunate occurring by chance.