illegal /ɪˈliːgəl/ adjective Learner's definition of ILLEGAL
1
: not allowed by the law : not legal非法的；违法的；不合法的 -
illegal [=illicit, unlawful] drugs违禁药物
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In this state, it is illegal for anyone under the age of 21 to drink alcohol.在这个州，任何人未满21岁饮酒都是违法的。
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an illegal alien/immigrant [=a foreign person who is living in a country without having official permission to live there]非法外侨/移民
2
: not allowed by the rules in a game（比赛中）违规的，犯规的 — illegality
/ˌɪlɪˈgæləti/ noun, plural illegalities — illegally
/ɪˈliːgəli/ adverb -
She was parked illegally in a handicapped parking spot.她把车违规停放在了残障人士停车位。
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Her camera was illegally seized at the border.她的照相机在边境被非法扣押了。
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people who are in the country illegally这个国家的非法居留者