au naturel
/əʊˌnɑːtjuːˈrel,〈法〉 onatyʀɛl/adjective & adverb
1- with no elaborate treatment, dressing, or preparation自然的（地）：
as adv. I wear my hair au naturel these days我这些天都没去做头发
as adj. the cheese is delicious whether au naturel or seasoned.奶酪不论是原味还是加调料的都很好吃。
1.1
- humorous naked〈幽默〉裸体的（地）：
as adv. the remote beach where we'd been camping au naturel.我们一直在那儿裸体野营的遥远海滩。
词源
French， literally 'in the natural (state)'.