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Definitions

radical

[rad-i-kuhl] / ˈræd ɪ kəl /
ADJECTIVE
fundamental, basic
Synonyms
STRONGEST
profound
STRONG
basal bottom cardinal constitutional essential native natural organic original primary primitive
WEAK
deep-seated foundational inherent innate intrinsic meat-and-potatoes primal thoroughgoing underlying vital
Antonyms
STRONG
inessential minor secondary unimportant
WEAK
extrinsic nonessential superficial
ADJECTIVE
deviating by extremes
Synonyms
STRONGEST
extremist fanatical far-out leftist militant progressive revolutionary sweeping uncompromising violent
STRONG
entire freethinking insurgent recusant refractory
WEAK
advanced anarchistic complete excessive iconoclastic immoderate insubordinate insurrectionary intransigent lawless mutinous nihilistic rabid rebellious recalcitrant restive riotous seditious severe thorough ultra ultraist way-out
Antonyms
STRONGEST
moderate
WEAK
conservative superficial
NOUN
person who advocates significant, often extreme change
Synonyms
STRONGEST
agitator anarchist extremist fanatic firebrand insurgent leftist militant progressive rebel reformer renegade revolutionary rioter subversive
STRONG
avant-garde freethinker iconoclast insurrectionist left-winger mutineer nihilist nonconformist objector pacifist secessionist
WEAK
revolter ultraist
Antonyms
WEAK
conservative moderate

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.

“I know I get labeled as this radical right wing voice, but I have moderates, a lot of moderates within my audience.”

From The Wall Street Journal • Apr. 11, 2026

It might sound radical, but how your funds are invested in retirement accounts is the least of your concerns to start — as long as they are invested.

From MarketWatch • Apr. 10, 2026

It’s radical to love someone because they’re honest, not in spite of their honesty.

From Salon • Apr. 3, 2026

Others said the move was evidence of a more radical turn by authorities.

From Barron's • Apr. 1, 2026

In March, his doctors decided to try a fairly new and radical treatment: electroshock.

From "The Woman All Spies Fear" by Amy Butler Greenfield

Vocabulary lists containing radical

Refugee

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Liberty, Equality, Vocabulary: The French Revolution

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100 Great Words from "Fahrenheit 451" -- Part I Vocabulary

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!