bad faith

Short definition from Wiktionary

Noun

1. 1
   The misrepresentation of one's own true motive.
2. 2
   An intent to deceive or mislead another to gain some advantage; dishonesty or fraud in a transaction (such as knowingly misrepresenting the quality of something that is being bought or sold).
3. 3
   A malicious motive by a party in a lawsuit, which has an effect on the ability to maintain causes of action and obtain legal remedies.
4. 4
   The existentialist concept of denying one's total freedom of will.