unfailing
"unfailing" is a 9-letter English headword indexed on PlainSpell.
The verdict
“unfailing” is an uncommon English word, ranked #52,696 in English word frequency and used as an adjective.
- #52,696
- frequency rank, English
- 9
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - inexhaustible
| Property | Value |
|---|---|
| Headword | unfailing |
| Language | English |
| Part of speech | Adjective |
| Letters | 9 |
| Frequency rank | #52,696 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “unfailing” sits in English frequency
Spelling & Dictionary Insight
The English entry for unfailing is 9 letters long, classified as an adjective. Corpus data places it at rank #52,696 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.
We couldn't generate a plausible misspelling set for unfailing, a sign its spelling follows regular English conventions. We don't track a confusable pairing for this entry, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From un- + failing. The correct English form is unfailing, spelled U-N-F-A-I-L-I-N-G.
Definition
- 1inexhaustible
- 2changeless, constant
- 3infallible
Etymology
From un- + failing.
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 "unfailing"?
What does "unfailing" mean?
What is the origin of the word "unfailing"?
Is PlainSpell free to use?
Using “unfailing”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is U-N-F-A-I-L-I-N-G - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
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.