Bareback

['beəbæk] or ['bɛrbæk]

(adj.) riding without a saddle; 'a bareback rider' .

(adv.) without a saddle; 'she prefers to ride her horse bareback'.

Inputed by Cornelia--From WordNet

(adv.) On the bare back of a horse, without using a saddle; as, to ride bareback.

Checked by Gardner