infallible

/ɪnˈfæl.ɪ.bl̩/

//ɪnˈfæl.ɪ.bl̩// noun

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

"infallible" is a 10-letter English headword indexed on PlainSpell.

The verdict

“infallible” has 14 generated spelling variants in the English index at frequency #28,253. The variants make it a useful spelling check.

#28,253
frequency rank, English
2,140
“I” headwords
14
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A person who, or an object or process that, is taken as being infallible.

Corpus desk

Index EN-infallible · infallible · English

infallible · rank #28,253 · 14 variants · 0 confusables

  • FREQ-MID #28,253
  • LEN-MEGA 10 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-HIGH 14 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH indistinct

Nearest frequency peer: indistinct (-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 “infallible”

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

corpus weight

What this shows “infallible” 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
Key facts for infallible
PropertyValue
Headwordinfallible
LanguageEnglish
Part of speechNoun
IPA/ɪnˈfæl.ɪ.bl̩/
Letters10
Frequency rank#28,253
Misspellings tracked14
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “infallible”

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

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “indistinct” (#28,252), “infuriating” (#28,254), “incandescent” (#28,251). Among 2,140 “I” headwords, “infallible” is #28,253. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 14 spelling variants around infallible (IPA /ɪnˈfæl.ɪ.bl̩/), anoun. Corpus frequency is #28,253 among 2,140 “I” headwords. Dominant gloss: "A person who, or an object or process that, is taken as being infallible.".

Our generated misspelling index lists 14 likely wrong-spelling variants for infallible, with forms such as "ifnallible", "inafllible", and "infalible". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. Our dataset records no confusable match here, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible. The correct English form is infallible, spelled I-N-F-A-L-L-I-B-L-E.

Definition

  1. 1
    A person who, or an object or process that, is taken as being infallible.

Etymology

From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible.

Common misspellings

Also misspelled as:

  • ifnallible
  • inafllible
  • infalible
  • infalilble
  • infallable
  • infallbile
  • infallibble
  • infallibel
  • infalliblle
  • infallilbe
  • inffallible
  • inflalible
  • innfallible
  • nifallible

Misspelling Pattern Breakdown

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

ifnallible2inafllible2infalible1infalilble2infallable1infallbile2infallibble1infallibel2
Edit distance from "infallible"

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 "infallible"?
"infallible" is spelled I-N-F-A-L-L-I-B-L-E. The IPA pronunciation is /ɪnˈfæl.ɪ.bl̩/.
What does "infallible" mean?
As a noun, "infallible" means: A person who, or an object or process that, is taken as being infallible.
What are common misspellings of "infallible"?
Common misspellings include "ifnallible", "inafllible", "infalible", "infalilble", "infallable". The correct spelling is "infallible".
How do you pronounce "infallible"?
The IPA (International Phonetic Alphabet) transcription for "infallible" is /ɪnˈfæl.ɪ.bl̩/. 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 "infallible"?
From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible. 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 "infallible", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 10 letters (nearest by frequency rank).

indistinct#28,252methodical#28,290Middletown#28,292furnishing#28,212

Similar misspelling depth

Headwords with a similar count of attested misspellings (14 here; floor ≥5).

outwardly14 variantsdissonance14 variantsdisposing14 variantsracetrack14 variants

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

Source: FrequencyWords open word-frequency list