complex

/ˈkɒmplɛks/

//ˈkɒmplɛks// adj

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

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

The verdict

“complex” has 11 generated spelling variants in the English index at frequency #1,449. The variants make it a useful spelling check.

#1,449
frequency rank, English
5,599
“C” headwords
11
tracked misspellings
12
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Made up of multiple parts; composite; not simple.

Corpus desk

Index EN-complex · complex · English

complex · rank #1,449 · 11 variants · 12 confusables

  • FREQ-COMMON #1,449
  • LEN-LONG 7 letters
  • VOW-2 2 vowels
  • CONFUS-MID 12 pairs
  • VAR-MID 11 variants
  • BOOK-DENSE 5,599
  • PHOTO-FINISH coffee

Nearest frequency peer: coffee (-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 “complex”

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

corpus weight

What this shows Bars show where “complex” 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).

complex vs couple
71% similar
complex vs comply
71% similar
complex vs Copley
57% similar

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

Key facts for complex
PropertyValue
Headwordcomplex
LanguageEnglish
Part of speechAdjective
IPA/ˈkɒmplɛks/
Letters7
Frequency rank#1,449
Misspellings tracked11
Confusable pairs12
SourceWiktionary (kaikki.org)

Where “complex” 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).complexlands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “coffee” (#1,448), “condition” (#1,450), “claims” (#1,447). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 11 spelling variants around complex (IPA /ˈkɒmplɛks/), anadjective. Corpus frequency is #1,449 among 5,599 “C” headwords. Wiktionary lists 6 senses, so context still picks the gloss.

Our generated misspelling index lists 11 likely wrong-spelling variants for complex, with forms such as "ccomplex", "cmoplex", and "comlpex". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 12 confusable-pair relationships, "couple", "comply", "Copley", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From French complexe, from Latin complexus, past participle of complector (“to entwine, encircle, compass, infold”), from com- (“together”) and plectō (“to weave, braid”). May be analyzed as com- + -plex. See complect. Doublet of complexus. The correct English form is complex, spelled C-O-M-P-L-E-X.

Definition

  1. 1
    Made up of multiple parts; composite; not simple.
  2. 2
    Not simple, easy, or straightforward; complicated.
  3. 3
    Having the form a + bi, where a and b are real numbers and i is (by definition) the imaginary square root of −1.
  4. 4
    Whose range is a subset of the complex numbers.
  5. 5
    Whose coefficients are complex numbers; defined over the field of complex numbers.
  6. 6
    A curve, polygon or other figure that crosses or intersects itself.

Recorded use

Wiktionary examples

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

  1. a complex being; a complex idea
  2. The human body is a complex system made up of many layers.

Etymology

From French complexe, from Latin complexus, past participle of complector (“to entwine, encircle, compass, infold”), from com- (“together”) and plectō (“to weave, braid”). May be analyzed as com- + -plex. See complect. Doublet of complexus.

Synonyms

complexcomplexedcomplicatecomplicatedconvolutedGordianinvoluteintricateinvolutionalinvolvedknottylabyrinthallabyrinthinemanifold

Antonyms

incomplexnoncomplexnoncomplicatedsimplesimplexstraightforwarduncomplexuncomplexeduncomplicatedunconvoluted

This word in other languages

complicado(Español)complexe(Français)kompliziert(Deutsch)complexo(Português)

Common misspellings

Also misspelled as:

  • ccomplex
  • cmoplex
  • comlpex
  • commplex
  • compelx
  • complexx
  • compllex
  • complxe
  • compplex
  • copmlex
  • ocmplex

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of complex - 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.

ccomplex1cmoplex2comlpex2commplex1compelx2complexx1compllex1complxe2
Edit distance from "complex"

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.

Frequently Asked Questions

How do you spell "complex"?
"complex" is spelled C-O-M-P-L-E-X. The IPA pronunciation is /ˈkɒmplɛks/.
What does "complex" mean?
As an adjective, "complex" means: Made up of multiple parts; composite; not simple.
What words are commonly confused with "complex"?
"complex" is commonly confused with "couple", "comply", "Copley". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "complex"?
The IPA (International Phonetic Alphabet) transcription for "complex" is /ˈkɒmplɛks/. 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 "complex"?
From French complexe, from Latin complexus, past participle of complector (“to entwine, encircle, compass, infold”), from com- (“together”) and plectō (“to weave, braid”). May be analyzed as com- + -plex. See complect. Doublet of complexus. 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 "complex", not the corpus desk frequency band.

Same letter count

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

evening#1,452freedom#1,454weather#1,443highest#1,457

Similar misspelling depth

Headwords with a similar count of attested misspellings (11 here; floor ≥5).

library11 variantsseconds11 variantswalking11 variantscomments11 variants

What to do next

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

  • "complex" maps to 12 confusable pairs in this vintage; the highest-scored is "couple". View pair
  • 11 edit-distance misspelling variants are generated for spell-check research on this headword. See variants
  • Usage frequency rank #1,449 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "C" letter cohort. C–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