pi·rate·like, adjective
pi·rat·i·cal, adjective
pi·rat·ic, adjective
pi·rat·i·cal·ly, adverb
Technically. Though not in the dictionary, from James McDermott's England and the Spanish Armada:So, sure, why not?their principal privateer, Galleon Fenner, suspected of being employed ' pirateously', had been seized by Admiralty officials