The word "jinx" refers to a person or thing that brings bad luck or misfortune. It can also be used as a verb, meaning to bring bad luck to someone or something. Essentially, if something is said to be jinxed, it is thought to cause failure or problems.
The term "jinx" comes from the late 19th century and is believed to be derived from the Latin word "iynx," which refers to a type of bird associated with witchcraft and divination powers. The bird was thought to have magical qualities.