endlong

Nor in vain: with a reluctant sob its bed of sand gave up the stubborn rock, and as it rolled endlong a devil that had urged excuse went from Christian.

From The Unknown Sea by Clemence Housman

Plunging endlong into the water, the impetus created by my fall from such a height would be slowly resisted by this denser element.

From Edgar Huntly or, Memoirs of a Sleep-Walker by Charles Brockden Brown

So Sir Percivale turned back, but Sir Launcelot rode on across and endlong in a wild forest, and held no path, but as wild adventure led him.

From Stories of King Arthur and His Knights Retold from Malory's "Morte dArthur" by U. Waldo Cutler

And right so these four knights came into the field endlong and through.

From Le Mort d'Arthur: Volume 2 by Sir Thomas Malory

Again did Birdalone take heart, and they hastened a long way up the stair, till Atra stayed at last at a door all done with iron, endlong and over-thwart. 

From The Water of the Wondrous Isles by William Morris