perfidiously
adverb
perfidiously is spelled P-E-R-F-I-D-I-O-U-S-L-Y: 12 letters. It appears about once in every 89 million words in written English, the 301,415th most frequent word form (wordfreq, 2021 data). As an adverb, perfidiously means “In a perfidious manner” (English Wiktionary, September 2026).
How many letters and syllables are in perfidiously?
| Letters | 12: P-E-R-F-I-D-I-O-U-S-L-Y |
|---|---|
| In writing | about once in every 89 million words; the 301,415th most frequent word form |
| Wrong spellings searched | none measured in search |
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).
How common is perfidiously?
Perfidiously appears about once in every 89 million words in written English, the 301,415th 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).
Forms of perfidiously
- more perfidiously comparative
- most perfidiously superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does perfidiously mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adverb
- 1
In a perfidious manner.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Perfidiously in Spanish, French, German and Portuguese
In the sense in a perfidious manner:
| Language | Words |
|---|---|
| German | heimtückisch, treulos |
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 perfidiously come from?
From perfidious + -ly.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).