radical

/ˈɹædɪkəl/

//ˈɹædɪkəl// adj

By · According to Wiktionary data (CC BY-SA) ·

"radical" is a 7-letter English headword indexed on PlainSpell.

The verdict

“radical” has 10 generated spelling variants in the English index at frequency #4,112. The variants make it a useful spelling check.

#4,112
frequency rank, English
3,094
“R” headwords
10
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Favoring fundamental change, or change at the root cause of a matter.

Corpus desk

Index EN-radical · radical · English

radical · rank #4,112 · 10 variants · 4 confusables

  • FREQ-COMMON #4,112
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-MID 4 pairs
  • VAR-MID 10 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH proven

Nearest frequency peer: proven (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Frequency neighbourhood for “radical”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “radical” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

radical vs rascal
71% similar
radical vs radically
78% similar
radical vs racial
71% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for radical
PropertyValue
Headwordradical
LanguageEnglish
Part of speechAdjective
IPA/ˈɹædɪkəl/
Letters7
Frequency rank#4,112
Misspellings tracked10
Confusable pairs4
SourceWiktionary (kaikki.org)

Where “radical” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). radical lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around radical (IPA /ˈɹædɪkəl/), anadjective. Corpus frequency is #4,112 among 3,094 “R” headwords. Wiktionary lists 9 senses, so context still picks the gloss.

Our generated misspelling index lists 10 likely wrong-spelling variants for radical, with forms such as "ardical", "radcial", and "raddical". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 4 confusable-pair relationships, "rascal", "radically", "racial", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: PIE word *wréh₂ds Inherited from Middle English radical, from Latin rādīcālis (“of or pertaining to the root, having roots, radical”). Compare grassroots. The correct English form is radical, spelled R-A-D-I-C-A-L.

Definition

  1. 1
    Favoring fundamental change, or change at the root cause of a matter.
  2. 2
    Pertaining to a root (of a plant).
  3. 3
    Pertaining to the basic or intrinsic nature of something.
  4. 4
    Thoroughgoing; far-reaching.
  5. 5
    Of or pertaining to the root of a word.
  6. 6
    Produced using the root of the tongue.
  7. 7
    Involving free radicals.
  8. 8
    Relating to a radix or mathematical root.
  9. 9
    Excellent; awesome.

Recorded use

Wiktionary examples

These source excerpts show how radical appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. His beliefs are radical.
  2. The most determined exertions of that authority, against them, only showed their radical independence.

Etymology

PIE word *wréh₂ds Inherited from Middle English radical, from Latin rādīcālis (“of or pertaining to the root, having roots, radical”). Compare grassroots.

Synonyms

primitiveJacobinJacobinicJacobinical

Antonyms

derivativederived

This word in other languages

radical(Français)radikal(Deutsch)radical(Português)

Common misspellings

Also misspelled as:

  • ardical
  • radcial
  • raddical
  • radiacl
  • radicall
  • radiccal
  • radicla
  • raidcal
  • rdaical
  • rradical

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of radical - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

ardical2radcial2raddical1radiacl2radicall1radiccal1radicla2raidcal2
Edit distance from "radical"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

Frequently Asked Questions

How do you spell "radical"?
"radical" is spelled R-A-D-I-C-A-L. The IPA pronunciation is /ˈɹædɪkəl/.
What does "radical" mean?
As an adjective, "radical" means: Favoring fundamental change, or change at the root cause of a matter.
What words are commonly confused with "radical"?
"radical" is commonly confused with "rascal", "radically", "racial". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "radical"?
The IPA (International Phonetic Alphabet) transcription for "radical" is /ˈɹædɪkəl/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "radical"?
PIE word *wréh₂ds Inherited from Middle English radical, from Latin rādīcālis (“of or pertaining to the root, having roots, radical”). Compare grassroots. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "radical", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

pretend#4,108premium#4,106Russell#4,119Nigeria#4,100

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

uniform10 variantsapparent10 variantsongoing10 variantspainful10 variants

What to do next

You've looked up "radical". Here's where to go from here.

  • "radical" maps to 4 confusable pairs in this vintage; the highest-scored is "rascal". View pair
  • 10 edit-distance misspelling variants are generated for spell-check research on this headword. See variants
  • Usage frequency rank #4,112 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "R" letter cohort. R–Z browse
  • PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list