underhand

His avarice was disgusting beyond words, and with avarice went a tendency to underhand dealing, harshness, and malice.

The result of his thinking forced the conclusion that Gregory was innocent of any underhand work.

By such false pretenses and underhand proceedings at Florence, the people of Rome, as well as their heroic friends, were deceived.

You work on an underhand system of policy which will be turned against you, for France will be tired of your shuffling.

"This seems to be Dirk Hawley's day for underhand work," muttered Chub.