doubtlessly
adverb
doubtlessly is spelled D-O-U-B-T-L-E-S-S-L-Y: 11 letters. It appears about once in every 8 million words in written English, the 85,266th most frequent word form (wordfreq, 2021 data). As an adverb, doubtlessly means “Without question; indubitably” (English Wiktionary, September 2026).
How many letters and syllables are in doubtlessly?
| Letters | 11: D-O-U-B-T-L-E-S-S-L-Y |
|---|---|
| In writing | about once in every 8 million words; the 85,266th 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 doubtlessly?
Doubtlessly appears about once in every 8 million words in written English, the 85,266th 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 doubtlessly
- more doubtlessly comparative
- most doubtlessly superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does doubtlessly mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adverb
- 1
proscribedWithout question; indubitably.
There are doubtlessly more insects than mammals.
- 2
obsoleteWithout feeling doubt, without misgivings.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does doubtlessly come from?
From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).