我喜欢这件衣服的简洁，没有多余的装饰。

I like the ___plainness of this dress—it has no unnecessary decorations.

这份报告的清晰性使所有读者都能轻松理解要点。

The ___plainness of this report made it easy for all readers to understand the key points.

他言语的朴实有时会让人感到惊讶。

The ___plainness of his speech sometimes surprises people.