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What is another word for illegal?

Need synonyms for illegal? Here's a list of similar words from our thesaurus that you can use instead.

Contexts ▼

Contrary to or forbidden by law, especially criminal law

Not in accordance with standards of honor, decency or fair play

Not having the required legal documents

Done or kept in secret, sometimes to conceal an illicit or improper purpose

Very disgusting, dirty or unpleasant

Lacking in accuracy or truth

Unwarranted or inappropriate due to being excessive or disproportionate

Engaged in piracy or plunder

Worthless or invalid

Foreigner in country without permission

… more ▼

Adjective

Contrary to or forbidden by law, especially criminal law

unauthorised^UK

unauthorized^US

unconstitutional

against the law

under-the-table

under-the-counter

under the counter

outside the law

under the table

dishonourable^UK

dishonorable^US

against the rules

contrary to law

in violation of law

illegally obtained

insurrectionary

without law and order

more ❯

“Coulson had resigned as the paper's editor following the conviction of a reporter in relation to illegal phone hacking, although stating that he knew nothing about it.”

Adjective

Not in accordance with standards of honor, decency or fair play

unsportsmanlike

dishonorable^US

dishonourable^UK

against the rules

double-crossing

against the law

under-the-table

under the counter

under the table

cloak-and-dagger

unconscientious

not to be trusted

of dubious character

potentially illegal

not to be depended on

intentionally misleading

like a snake in the grass

not trustworthy

not entirely truthful

terminologically inexact

economical with the truth

not to be relied upon

not quite right

crazy like a fox

gone to the dogs

hole-and-corner

playing politics

not straightforward

snake in the grass

lacking sincerity

with tongue in cheek

more ❯

“He was dismissed by the referee for an illegal tackle.”

Adjective

Not having the required legal documents

unauthorised^UK

unauthorized^US

unsubstantiated

unauthenticated

“As an illegal resident, you can easily be exploited by a variety of ruthless persons, not the least of whom might be your landlord.”

Adjective

Done or kept in secret, sometimes to conceal an illicit or improper purpose

behind-the-scenes

hole-and-corner

cloak-and-dagger

under-the-table

hole-in-the-corner

under-the-counter

in holes and corners

under the table

dishonourable^UK

dishonorable^US

behind someone's back

strictly confidential

behind the scenes

not for publication

not to be disclosed

not for circulation

not to be made public

unauthorized^US

unauthorised^UK

under the counter

mum^UK

cloak and dagger

mom^US

hole and corner

unsportsmanlike

playing politics

not straightforward

under one's hat

close to one's chest

not in the public domain

crazy like a fox

as sharp as a tack

like a snake in the grass

potentially illegal

of dubious character

more ❯

Adjective

Very disgusting, dirty or unpleasant

unsportsmanlike

more ❯

Adjective

Lacking in accuracy or truth

unsubstantiated

wide of the mark

wrongly inferred

without foundation

not trustworthy

out of commission

on the wrong track

more ❯

Adjective

Unwarranted or inappropriate due to being excessive or disproportionate

disproportionate

lacking in propriety

unfavourable^UK

out of character

not good enough

against the rules

beyond the pale

contrary to the rules

disadvantageous

uncomplimentary

dishonourable^UK

dishonorable^US

beneath one's dignity

near the knuckle

inappropriate to

lacking dignity

unworthy of one

infra indignitatem

out of its element

not designed for

not up to scratch

not good enough for

out of place with

out of character with

sticking out a mile

standing out a mile

like a fish out of water

low-down and dirty

more ❯

Adjective

Engaged in piracy or plunder

Adjective

Worthless or invalid

not what it is cracked up to be

more ❯

Noun

Foreigner in country without permission

illegal immigrant

undocumented alien

undocumented immigrant

unlawful non-citizen

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illegalizations

See Also

What is the opposite of illegal?
Sentences with the word illegal
Words that rhyme with illegal
What is the plural of illegal?
What is the adverb for illegal?
What is the adjective for illegal?
What is the noun for illegal?
Translations for illegal
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Nearby Words

illegal combatant

illegal combatants

illegal copying

7-letter Words Starting With

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