It's laziness, pure and simple.

这全然是懒惰。

It's a business proposition, pure and simple. No strings attached.

这只是个业务建议，仅此而已，没有任何附带条件。

Some were snobs pure and simple.

有些人是十足的势利鬼。

It is a swindle, pure and simple.

这简直是欺骗。这纯粹是欺骗。

The truth is rarely pure and simple.

真相很少纯粹，也决不简单。