Something unadorned has no decorations or frills. It's plain, like a room with nothing on the walls or a person wearing purely functional clothes and no accessories. ... If something is unadorned, it lacks decorations.

What is the meaning unadorned?

: not adorned : lacking embellishment or decoration : plain, simple.

What is the other meaning of plain?

(Entry 1 of 5) 1 : lacking ornament : undecorated. 2 : free of extraneous matter : pure. 3 : free of impediments to view : unobstructed.