Pi·rat·ic·al a. Of or pertaining to a pirate; acquired by, or practicing, piracy; as, a piratical undertaking. “Piratical printers.” --Pope. -- Pi*rat*ic*al*ly, adv.
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piratical
adj 1: characteristic of pirates; "piratical attackers"
2: characteristic of piracy; "piratical editions of my book"