Disposable nappies are fairly straightforward to put on.

一次性尿布很容易穿上。

The question seemed straightforward enough.

这个问题看起来够简单的。

...simple straightforward language.

简单易懂的语言

She is very blunt, very straightforward and very honest.

她非常直率，很坦诚，也非常诚实。

I was impressed by his straightforward intelligent manner.

我很欣赏他的坦率和睿智。