General terms:
* Open-ended: This is a common term for a story that leaves questions unanswered.
* Unresolved: This term emphasizes that the story doesn't provide closure.
* Ambiguous: This term implies that the ending is open to interpretation.
* Cliffhanger: This term is usually used for a story that ends on a suspenseful note, leaving the reader wanting more.
Genre-specific terms:
* Mystery: In mystery stories, an unsolved ending might be called a cold case or a mystery that remains unsolved.
* Thriller: A thriller with an unsolved ending might be described as unsettling, ominous, or leaving the reader with a sense of unease.
* Science Fiction: An unsolved ending in science fiction could be thought-provoking, philosophical, or leaving the reader to ponder the possibilities.
Other possibilities:
* Incomplete: This term is sometimes used for a story that feels unfinished.
* Frustrating: This is a subjective term, but some readers find unsolved endings frustrating.
* Intriguing: Some readers find unsolved endings intriguing and thought-provoking.
Ultimately, the best way to describe an unsolved ending depends on the specific story and the effect you want to achieve.