perfidiousness
"perfidiousness" is a 14-letter English headword indexed on PlainSpell.
The verdict
“perfidiousness” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 14
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Unfaithfulness; deceitfulness; perfidy.
Corpus desk
Index EN-perfidiousness · perfidiousness · English
perfidiousness · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 14 letters
- VOW-6 6 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "P" thin
- PHOTO-UNK Peer pending
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.
| Property | Value |
|---|---|
| Headword | perfidiousness |
| Language | English |
| Part of speech | Noun |
| Letters | 14 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “perfidiousness” in English
Rare enough to double-check
perfidiousness is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "Unfaithfulness; deceitfulness; perfidy.".
Our edit-distance generator produced no likely misspellings for perfidiousness, a sign its spelling follows regular English conventions. Our confusable-pair dataset has no match for it, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From perfidious + -ness. The correct English form is perfidiousness, spelled P-E-R-F-I-D-I-O-U-S-N-E-S-S.
Definition
- 1Unfaithfulness; deceitfulness; perfidy.
Recorded use
Wiktionary exampleThese source excerpts show how perfidiousness appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Not only Cato is vanquished by Caesar, but the treachery and perfidiousness of Syphax prevail over the honest simplicity and the credulity of Juba.
Etymology
From perfidious + -ness.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.