Verbose is to concise as unscrupulous is to principled. The definition of the word unscrupulous is fairly synonymous with unprincipled.

Unscrupulous is an adjective which means immoral. Thus, it can be used in the following sentences:

The politician was so unscrupulous that he lied about his opponent to get elected.

There are a lot of unscrupulous policemen at the borders who take bribes in order to let drugs in.

I've never heard someone be as unscrupulous as the factory owner who lied and said his cars were safe when they weren't.

The mayor was forced to resign because of his unscrupulous business dealings.

If you think or feel she's unscrupulous, you're probably right.

The unscrupulous businessman was willing to deceive his customers to make a profit.