infallible
in·fal·li·ble/ɪnˈfælɪbəl/noun, adjective
infallible is spelled I-N-F-A-L-L-I-B-L-E, 4 syllables: in·fal·li·ble. The wrong spelling people search most is infallable: about 160 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 15 of all searches for the word. Infallible is a noun meaning “A person who, or an object or process that, is taken as being infallible”. The plural of infallible is infallibles.
How many letters and syllables are in infallible?
| Letters | 10: I-N-F-A-L-L-I-B-L-E |
|---|---|
| Syllables | 4: in·fal·li·ble |
| In writing | 1.0 times per million words; the 28,214th most frequent word form |
| Wrong spellings searched | 1; the most searched, infallable, about 160 Bing searches a month (all of them) |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).
How do you spell infallible?
Infallible is spelled I-N-F-A-L-L-I-B-L-E. One wrong spelling is searched or written often enough to measure; together they are about 1 in 15 of the searches for infallible in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
How common is infallible?
Infallible appears 1.0 times per million words in written English, the 28,214th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce infallible?
- /ɪnˈfælɪbəl/
- [ɪnˈfælɪbəl] ~ [ɪnˈfælɪbl̩]
- /ɪɱˈfælɪbəl/
Infallible has 4 syllables, split in·fal·li·ble in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-infallible.ogg, En-au-infallible.ogg, Wikimedia Commons (author and licence on each file's page).
Forms of infallible
- infallibles plural
- more infallible comparative
- most infallible superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does infallible mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A person who, or an object or process that, is taken as being infallible.
adjective
- 1
Without fault or weakness; incapable of error or fallacy.
He knows about many things, but even he is not infallible.
- 2
Certain to produce the intended effect; sure.
Try this infallible cure for hiccups.
- 3
Certain to result from a specific cause; inevitable.
noun
- 1
Any of the fourteen central religious figures believed by Twelver Shia Muslims to be infallible, consisting of Muhammad, his daughter Fatima, and the Twelve Imams recognized by Twelvers.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Infallible in Spanish, French, German and Portuguese
In the sense without fault or weakness; incapable of error or fallacy:
| Language | Words |
|---|---|
| French | infaillible |
| German | unfehlbar |
| Portuguese | infalível |
| Spanish | infalible, inmancable |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does infallible come from?
From Medieval Latin īnfallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).