Dishonest behaviour is a term used to describe any kind of behaviour that is not in line with accepted standards of morality or law. KNAVERY, which has 7 letters, is a synonym for dishonest behaviour and is defined as the use of cunning or deceitful tricks to gain an advantage. WRONGDOING, which has 10 letters, is another synonym for dishonest behaviour and is defined as an act that is illegal or morally wrong.