treacherously
adverb
treacherously is spelled T-R-E-A-C-H-E-R-O-U-S-L-Y: 13 letters. It appears about once in every 8 million words in written English, the 83,271st most frequent word form (wordfreq, 2021 data). As an adverb, treacherously means “In a treacherous manner” (English Wiktionary, September 2026).
How many letters and syllables are in treacherously?
| Letters | 13: T-R-E-A-C-H-E-R-O-U-S-L-Y |
|---|---|
| In writing | about once in every 8 million words; the 83,271st 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 treacherously?
Treacherously appears about once in every 8 million words in written English, the 83,271st 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 treacherously?
- US
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Flame,_not_lame-treacherously.wav, Wikimedia Commons (author and licence on each file's page).
Forms of treacherously
- more treacherously comparative
- most treacherously superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does treacherously mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adverb
- 1
In a treacherous manner.
The former spy behaved treacherously.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Treacherously in Spanish, French, German and Portuguese
In the sense in a treacherous manner:
| Language | Words |
|---|---|
| French | traîtreusement |
| Portuguese | traiçoeiramente |
| Spanish | traidoramente |
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 treacherously come from?
From treacherous + -ly.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).