unconcluded

This is actually shown by the fact that measurement proves to be an unconcluded and inconcludable operation.

Thus was she borne, the service being unconcluded, to her chamber.

Cash in consideration of an unconcluded marriage; that was how it read.

The Consul (or Vice-Consul) who took us for a drive told us a thrilling tale—as yet unconcluded—of two rival families.

In real life we do not call that a story where everything is left unconcluded and in the air.