fallacy

/ˈfæl.ə.si/

//ˈfæl.ə.si// noun

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

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

The verdict

“fallacy” has 9 generated spelling variants in the English index at frequency #22,081. The variants make it a useful spelling check.

#22,081
frequency rank, English
2,507
“F” headwords
9
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Deceptive or false appearance; that which misleads the eye or the mind.

Corpus desk

Index EN-fallacy · fallacy · English

fallacy · rank #22,081 · 9 variants · 1 confusable

  • FREQ-MID #22,081
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-LOW 1 pairs
  • VAR-MID 9 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH fairytale

Nearest frequency peer: fairytale (-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.

Rank peers near misspelling magnet “fallacy”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “fallacy” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

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).

fallacy vs fallback
75% similar

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

Key facts for fallacy
PropertyValue
Headwordfallacy
LanguageEnglish
Part of speechNoun
IPA/ˈfæl.ə.si/
Letters7
Frequency rank#22,081
Misspellings tracked9
Confusable pairs1
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “fallacy”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).fallacylands here:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “fairytale” (#22,080), “feeble” (#22,082), “fend” (#22,083). Among 2,507 “F” headwords, “fallacy” is #22,081. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 9 spelling variants around fallacy (IPA /ˈfæl.ə.si/), anoun. Corpus frequency is #22,081 among 2,507 “F” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 9 likely wrong-spelling variants for fallacy, with forms such as "afllacy", "falacy", and "falalcy". 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 1 confusable-pair relationship, "fallback", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”). The correct English form is fallacy, spelled F-A-L-L-A-C-Y.

Definition

  1. 1
    Deceptive or false appearance; that which misleads the eye or the mind.
  2. 2
    An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not; a specious argument.

Recorded use

Wiktionary examples

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

  1. Mr Jones expressed great gratitude to the lady for the kind intentions towards him which she had expressed, and indeed testified, by this proposal; but, besides intimating some diffidence of success from the lady’s knowledge of his love to her niece, which had not been her case in regard to Mr Fitzpatrick, he said, he was afraid Miss Western would never a…
  2. I no longer believe in happiness, because I see the fallacy of my first belief; and the examination which that induced, has shewn me the fallacy of all. Shew me a heart without its hidden wound.

Etymology

From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”).

This word in other languages

falacia(Español)tromperie(Français)Täuschung(Deutsch)ilusão(Português)

Common misspellings

Also misspelled as:

  • afllacy
  • falacy
  • falalcy
  • fallaccy
  • fallacyy
  • fallayc
  • fallcay
  • ffallacy
  • flalacy

Misspelling Pattern Breakdown

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

afllacy2falacy1falalcy2fallaccy1fallacyy1fallayc2fallcay2ffallacy1
Edit distance from "fallacy"

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 "fallacy"?
"fallacy" is spelled F-A-L-L-A-C-Y. The IPA pronunciation is /ˈfæl.ə.si/.
What does "fallacy" mean?
As a noun, "fallacy" means: Deceptive or false appearance; that which misleads the eye or the mind.
What words are commonly confused with "fallacy"?
"fallacy" is commonly confused with "fallback". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "fallacy"?
The IPA (International Phonetic Alphabet) transcription for "fallacy" is /ˈfæl.ə.si/. 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 "fallacy"?
From Middle English fallaci, fallace, fallas, from Old French fallace, from Latin fallācia (“deception, deceit”), from fallāx (“deceptive, deceitful”), from fallere (“to deceive”). 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 "fallacy", not the corpus desk frequency band.

Same letter count

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

fifties#22,085esports#22,076gallant#22,092guesses#22,101

Similar misspelling depth

Headwords with a similar count of attested misspellings (9 here; floor ≥5).

gazing9 variantsdisarm9 variantsHarmon9 variantshermit9 variants

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

Source: FrequencyWords open word-frequency list