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"an illegal chess move"adjectiveprohibited by law or by official or accepted rules
Similar:
black-market bootleg contraband criminal dirty embezzled extrajudicial extralegal felonious hot ill-gotten illegitimate illicit ineligible misappropriated misbranded mislabeled nonlegal outlaw outlawed penal prohibited punishable smuggled under-the-counter unlawful unratified amerciable banned blackOpposite:
Words sounding like good illegal
legal illegal eagle beagle seagull regal paralegal inveigle viceregal theban eagle sea eagle king eagle imperial eagle double eagle der spiegel kite eagle stock eagle american eagle medicolegal nonlegal make legal porbeagle spread-eagle harrier eagle war eagle bald eagle basket beagle half eagle hawk eagle vulturine eagle