The definition of austere is someone or something that is minimalistic, something that is very somber or someone inflexible or extreme.
Bare is defined as a lack of clothing or refers to something that is empty of its usual contents.
The definition of plain is clearly understood, obvious, simple or not complicated.
Easy to understand, do, or carry out:
Without adornment or embellishment; simple or plain.
Find another word for undecorated. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for undecorated, like: austere, bare, plain, simple, unadorned, unembellished and adorned.