“质朴的”的英语可以翻译为：plain，simple，unaffected，unpretending，unvarnished ...

装修厨房的时候，肯尼思选择的是一种亲切质朴的田园风格。When he came to decorate the kitchen, Kenneth opted for a friendly rustic look.他把天真质朴的奇怪品质同锐利的机智和老练的世故结合了起来.He combined curious qualities of naivete with incisive wit and worldly sophistication...