unriddenadj.

1574 in J. Raine Wills & Inventories Archdeaconry Richmond (1853) 248 Horses at Burghe. Ridden horsses and mares, xv... Stages and fillies unreden, xij.

1607 G. Markham Cavelarice iv. 5 Foales, vnridden horses, or horses that are of any..sobrietie in iourneying.

1615 in J. Stuart Extracts Council Reg. Aberdeen (1848) II. 323 Leaving the saidis merches unridden.

1673 R. Almond Eng. Horsman v. 23 Some there are so opinionative, that being able to sit a rough unridden Colt a few plunges by holding Monkey like, with both hands to the Mane and Pummel.

1770 London Evening Post 21 July I'm afraid my merry and ingenious friend..often mounts himself on an unridden colt, and finds himself so happily pleased and exercised in this manner of riding, that he is not aware what dirt he flings, or whose shins he breaks.

1831 G. P. R. James Philip Augustus III. v Horses..which have stood there unridden for months.

1857 Ld. Dufferin Lett. from High Latitudes (ed. 2) 83 Having caught, saddled and bridled the three unridden ponies.

1927 Times 3 May 6/3 Sixty-two motor-bicycles, absolutely new and unridden, started from Birmingham..on a circuitous route to Buxton.

1971 J. Cheever Jrnls. (1991) 274 Josephine is a lonely and unridden horse.

2002 Surfer's Path June 88/2 Of course there are still millions of unridden waves, some protected, some undiscovered.