Synonyms of illegal in English:

illegal


See definition of illegal

adjective

1‘gangs operating illegal gambling’

SYNONYMS
unlawful, illicit, illegitimate, against the law, criminal, lawbreaking, actionable, felonious
unlicensed, unauthorized, unsanctioned, unwarranted, unofficial
outlawed, banned, forbidden, barred, prohibited, interdicted, proscribed, not allowed, not permitted
contraband, black-market, under the counter, bootleg
malfeasant
verboten
informal crooked, shady
British informal bent, dodgy
rare non licet
ANTONYMS

legal, lawful

2‘illegal play will be penalized by surrendering possession of the ball’

SYNONYMS
foul, against the rules
unfair, unsporting, unsportsmanlike, below the belt, dirty, dishonourable, dishonest, underhand, cheating
ANTONYMS

legal, legitimate