Unadorned means plain — nothing extra has been added to make it look nicer. It describes rooms, buildings, clothes, walls, food, and writing: an unadorned white wall, an unadorned wooden table, an unadorned style of prose. To adorn something is to decorate it, so unadorned is the absence of decoration. What makes the word worth learning is its tone. Unlike 'plain' or 'boring', unadorned usually carries quiet approval: it suggests clean, honest, confident simplicity, the kind a designer or a critic admires. A writer praising a poet's unadorned language means the poet trusted the words and did not dress them up. It is a formal, written word, common in reviews, architecture, and descriptions of art. It also has a very useful figurative use with truth and facts: 'the unadorned truth' or 'the plain unadorned facts' means the story told without softening, exaggeration, or anything added to make it more pleasant — which is a compliment to honesty, not to decoration. One thing to notice: unadorned describes something that was left plain, so it works best where decoration was possible and someone chose against it. You would not call a stone in a field unadorned; you would call a church, a dress, or a sentence unadorned.