The word "piratical" is an adjective that is used to describe something that is characteristic of pirates or piracy. Therefore, antonyms for "most piratical" would be adjectives that describe things that are opposite to piracy. Some possible antonyms for "most piratical" are lawful, legal, honest, aboveboard, just, ethical, and proper. These words indicate ethical conduct, adherence to rules, and honesty, which are characteristics that are typically the opposite of the stereotypical image of pirates. Antonyms for "most piratical" show that there is a wide range of behaviors and attitudes that are very different from the actions of pirates, and that can be used to build a more positive culture of respect and legality in society.