ILLEGAL
illegal
(adjective) prohibited by law or by official or accepted rules; “an illegal chess move”
Source: WordNet® 3.1
Etymology
Adjective
illegal (comparative more illegal, superlative most illegal)
Contrary to or forbidden by law, especially criminal law.
Forbidden by established rules.
(philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
(of a person, sometimes offensive) Being or doing something illegally.
(chiefly, US, sometimes, offensive) Being an illegal immigrant; residing in a country illegally.
Usage notes
The use of "illegal" to describe a person rather than an action is often regarded as offensive; see below.
Synonyms
• (forbidden by law): criminal, felonious, illicit, unlawful, irregular
• (totally fictitious): bogus
Antonyms
• (forbidden by law): lawful, legal
Noun
illegal (plural illegals)
(obsolete) An illegal act or technique.
(colloquial, plural, as illegals) Contraband, esp. illegal substances such as drugs.
(colloquial, offensive) An illegal immigrant.
(espionage) A spy working abroad illegally and undercover, without visible ties to his or her country’s authorities.
Synonyms
• (illegal immigrant) crimmigrant
Usage notes
• The use of "illegal" as a noun is especially charged.
Anagrams
• gill-ale
Source: Wiktionary
Il*le"gal, a. Etym: [Pref. il- not + legal: cf. F. illégal.]
Definition: 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. Bp. Burnet.
Source: Webster’s Unabridged Dictionary 1913 Edition