unsolved

Neither Mr. Gelb nor the unions claimed responsibility for the spray painted vulgarities, and the case remains unsolved.

It was a sign of a deeper and as yet unsolved problem: Budget rules often run counter to common sense.

And yet, ultimately the book is unsatisfying, because the mystery remains unexpectedly unsolved.

The alleged connection is just one of several mysteries left unsolved.

In Broadchurch, as in life, some mysteries must remain unsolved.

There was no bond between them, and the matter remained for a while an unsolved mystery.

Also she did not like to ride past the hill on the Dollar Sign road, with its hints of unsolved mystery.

Grace had forgotten all her resentment towards Mark, forgotten that the secret that lay between them was still unsolved.

Proofs and disproofs alike have been offered of the existence of an infinite deity, but the problem remains unsolved.

The Frankfort assembly had left the Austrian riddle unsolved, and apparently insoluble.