What is another word for "bareback"?

Roget's Thesaurus (1911) lists these synonyms for "bareback": altogether, back, bald, bare, barebacked, barefoot, bareness, birthday, buff, callow, cast, coot, cover, decorticate, decortication, denudation, denude, depilation, desquamation, disfurnish, dishabille, dismantle, disrobe, divest, divestment, doff, dress, enrobe, excoriate, excoriation, exfoliate, exfoliation, expose, flay, garb, hairless, hand, lay, leafless, mew.