illegal

[ih-lee-guhl] / ɪˈli gəl /

ADJECTIVE

against the law

Synonyms

STRONGEST

banned criminal illegitimate illicit irregular outlawed prohibited smuggled unauthorized unconstitutional unlawful unlicensed unwarranted wrongful

WEAK

actionable black-market bootleg contraband crooked extralegal felonious forbidden heavy hot interdicted lawless not approved not legal outside the law proscribed prosecutable racket shady sub-rosa taboo under-the-table unofficial unwarrantable verboten violating wildcat

Antonyms

STRONGEST

authorized blessed ethical good justifiable lawful legal legitimate moral permitted right warranted

WEAK

allowed permissible

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Tanisa is not a regulated immigration adviser and as a result it is illegal for her to offer immigration advice.

From BBC • Apr. 15, 2026

These are often people whose student, work or tourist visas have expired, rather than those who have just arrived in the country on small boats or through other illegal routes.

From BBC • Apr. 15, 2026

Founder Xu Jiayin, known as Hui Ka Yan in Cantonese, was reportedly held by police in 2023, with Evergrande saying he had been subjected to measures "due to suspicion of illegal crimes".

From Barron's • Apr. 14, 2026

“Focusing on illegal wildlife trade is not enough,” said Meredith Gore, a conservation criminologist at the University of Maryland and a co-author of the study.

From Los Angeles Times • Apr. 13, 2026

If you were an American citizen, it was illegal in most cases to visit Cuba from the United States, but permission was like this.

From "Mountains Beyond Mountains" by Tracy Kidder and Michael French

Vocabulary lists containing illegal

List 3

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

"A Natural Balance" and "In My Dreams"

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

Fear and Loathing in Cleveland: Trump's RNC Acceptance Speech

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!