Given the task definition and input, reply with output. In this task, you are given a sentence in Spanish and your task is to translate it into English. In translation, keep the numbers and capitalization (capitalize only the first word of each sentence and name).

La legislación retroactiva es una legislación perversa, una legislación injusta y a menudo una legislación impracticable.

Retrospective law is bad law, it is unfair law and often it is unworkable law.