infallibly

Name: infallibly, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/ɪnˈfæl.ɪ.bli/

//ɪnˈfæl.ɪ.bli// adv

By PlainSpell · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“infallibly” is uncommon English (frequency #98,258 among 17,902 “I” headwords), classed as an adverb. The kind of spelling people second-guess.

#98,258
frequency rank, English: 17,902
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - In an infallible manner.

Key facts for infallibly
Property	Value
Headword	infallibly
Language	English
Part of speech	Adverb
IPA	/ɪnˈfæl.ɪ.bli/
Letters	10
Frequency rank	#98,258
Misspellings tracked	0
Confusable pairs	0
Source	Wiktionary (kaikki.org)

Where “infallibly” 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). infallibly lands here:

#98,258

#1#100#1K#10K#100K

← used constantlyrarely used →

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

Rare enough to double-check

infallibly is uncommon English at frequency #98,258 among 17,902 “I” headwords, classed as anadverb, transcribed /ɪnˈfæl.ɪ.bli/. Rarity is why readers land here mid-draft. Gloss: "In an infallible manner.".

infallibly doesn't appear in our generated misspelling index, a straightforward case of a spelling with little room for common typos. Our dataset records no confusable match here, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From infallible + -ly. The correct English form is infallibly, spelled I-N-F-A-L-L-I-B-L-Y.

Definition

1
In an infallible manner.

Etymology

From infallible + -ly.

This word in other languages

infaliblemente(Español)infailliblement(Français)fehlerfrei(Deutsch)

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 "infallibly"?

"infallibly" is spelled I-N-F-A-L-L-I-B-L-Y. The IPA pronunciation is /ɪnˈfæl.ɪ.bli/.

What does "infallibly" mean?

As an adverb, "infallibly" means: In an infallible manner.

How do you pronounce "infallibly"?

The IPA (International Phonetic Alphabet) transcription for "infallibly" is /ɪnˈfæl.ɪ.bli/. 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 "infallibly"?

From infallible + -ly. 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.

Using “infallibly”

The practical upshot for anyone who landed here from a spell-check.

The one correct English spelling is I-N-F-A-L-L-I-B-L-Y - every other letter order is a misspelling in standard orthography.
Say it as /ɪnˈfæl.ɪ.bli/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
Browse more English words and confusable pairs in the same reference. English words

Other uncommon English words near this rank

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.