doubtlessly

adv

By · According to Wiktionary data (CC BY-SA) ·

"doubtlessly" is a 11-letter English headword indexed on PlainSpell.

The verdict

“doubtlessly” is an uncommon English word, ranked #85,191 in English word frequency and used as an adverb.

#85,191
frequency rank, English
11
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Without question; indubitably.

Key facts for doubtlessly
PropertyValue
Headworddoubtlessly
LanguageEnglish
Part of speechAdverb
Letters11
Frequency rank#85,191
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “doubtlessly” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). doubtlessly lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for doubtlessly is 11 letters long, classified as an adverb. Corpus data places it at rank #85,191 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.

Our edit-distance generator produced no likely misspellings for doubtlessly, a straightforward case of a spelling with little room for common typos. No close-neighbour confusable shows up for this headword in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly. The correct English form is doubtlessly, spelled D-O-U-B-T-L-E-S-S-L-Y.

Definition

  1. 1
    Without question; indubitably.
  2. 2
    Without feeling doubt, without misgivings.

Etymology

From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly.

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 "doubtlessly"?
"doubtlessly" is spelled D-O-U-B-T-L-E-S-S-L-Y.
What does "doubtlessly" mean?
As an adverb, "doubtlessly" means: Without question; indubitably.
What is the origin of the word "doubtlessly"?
From Middle English doutelesly, dowtelesly, equivalent to doubtless + -ly. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “doubtlessly”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is D-O-U-B-T-L-E-S-S-L-Y - 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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list