Definify.com

Webster 1913 Edition

Riderless

Rid′er-less

,

Adj.

Having no rider;

as, a

riderless

horse

.

H. Kingsley.

Definition 2024

riderless

riderless

English

Adjective

riderless ‎(not comparable)

Without or deprived of a rider.
- 1848, Charles Dickens, Dombey and Son
  ...the spectacle of Rob the Grinder returning down the street, leading the riderless horse, appeared to have some extraneous interest...