illegal | English to English Dictionary

prohibited by law or by official or accepted rules(adj.all)

Example:
An illegal chess move.

Antonym:
legal

source: wordnet30
Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral; as, an illegal act; illegal trade; illegal love.(adjective)

source: webster1913

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