Synonyms for

Illegal

Verb / ˌɪˈli:gʌl / Another word for illegal — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

not allowed by law; against the law

Synonyms & similar words

legal unlawful illicit prohibited forbidden banned taboo criminal unauthorized unpermitted outlawed black-market unlicensed contraband bootleg underground off-limits restricted unconstitutional lawless felonious

Synonyms by register

Formal

unlawful illicit prohibited forbidden

Informal

bogus shady off the books underground

Literary

contrary to law outlawed

Antonyms

legal lawful legitimate authorized permitted allowed licit

Common collocations

  • illegal immigration
  • illegal activity
  • illegal drugs
  • illegal parking
  • illegal substance
  • illegal weapon
  • illegal entry

Word family

noun illegality
adverb illegally

Usage note

Often used in legal contexts. Can also refer to actions that are morally wrong, even if not strictly against the law.

Example sentences

  1. It is illegal to drive without wearing a seatbelt.
  2. The store was shut down for selling illegal merchandise.
  3. Smoking marijuana is illegal in many states.
  4. The company was fined for hiring illegal immigrants.
  5. The hunter was caught with an illegal weapon.

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