inexplainable

Now comes the wonderful, inexplainable, part of the story.

From Further Adventures of Quincy Adams Sawyer and Mason Corner Folks by Pidgin, Charles Felton

The third, and to me the most remarkable, class is found not in certain personages or superstitious and determined proceedings, but in sudden and capricious scenes, and in improbable and inexplainable apparitions.

From The Philippine Islands, 1493-1898 - Volume 40 of 55 1690-1691 Explorations by Early Navigators, Descriptions of the Islands and Their Peoples, Their History and Records of the Catholic Missions, as Related in Contemporaneous Books and Manuscripts, Showing the Political, Economic, Commercial and Religious Conditions of Those Islands from Their Earliest Relations with European Nations to the Close of the Nineteenth Century by Blair, Emma Helen

During the various trips several mysterious and inexplainable things occurred.

From The Wonder Island Boys: Exploring the Island by Finlay, Roger Thompson

He made no reply and continued to stare at them as if he thought it inexplainable that two white men should suddenly invade his sleeping quarters.

From The Mark of the Knife by Ernst, Clayton H.

It has already been said it was the custom of Deerfoot to follow a certain inexplainable intuition which often came to his help in his moments of doubt.

From Camp-fire and Wigwam by Ellis, Edward Sylvester