IPA: /ˌʌnəˈdɔːrnd/
KK: /ʌnəˈdɔrnd/
Something that is simple and plain, without any decorations or extra details.
The room was unadorned, with just a table and a chair.
Unadorned → It is formed from "un-" (meaning not) and "adorned" (from Latin "adornare", meaning to equip or decorate). The word "unadorned" means not decorated or equipped, referring to something plain or simple.
Think of 'not' ('un-') having any 'decoration' ('adorned') — that's why unadorned means plain or simple.