A more thorough explanation:

Definition: In pessima fide (in pes-mə fI-dee) is a Latin term that means "in the worst faith."

Examples:

• A seller who knowingly sells a defective product to a buyer is acting in pessima fide.
• An employer who promises to pay an employee but never does is acting in pessima fide.

These examples illustrate the definition of in pessima fide because they both involve a party acting in bad faith. In both cases, the person making the promise or selling the product knows that they are not fulfilling their end of the bargain, but they do it anyway. This is considered the worst kind of faith because it involves intentionally deceiving someone else.