illegal adj.
VERBS be | become | remain | declare sth, deem sth, judge, make sth, pronounce sth, rule sth Their action was judged illegal by the International Court. The sale of these knives should be made illegal.
ADV. highly | absolutely, quite, strictly, totally | allegedly | technically Prize-fighting remained popular, though technically illegal, until the 1880s.
You can also check other dicts: illegal (English, 中文解释 ), wordnet sense, Collins Definition