doubtless

1 of 2

adjective

Synonyms of doubtlessnext
: free from doubt : certain
doubtlessly adverb
doubtlessness noun

doubtlessness

2 of 2

noun

doubt·​less·​ness
plural -es
: the quality or state of being doubtless

Examples of doubtless in a Sentence

Adjective another one of his doubtless predictions that will never come true
Recent Examples on the Web
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Adjective
As a result, mathematical truths do not make up a unified whole of equally indubitable truths; instead, their status as knowledge varies gradually from doubtless facts to increasingly uncertain hypotheses. Quanta Magazine, 18 May 2026 Lastly, while there is doubtless a tradeoff between construction costs and operations, a smooth operation at the big airport this coming summer — the busiest travel season — sure as heck needs to be a priority. The Editorial Board, Chicago Tribune, 4 Mar. 2026 Add in the doubtless significant number of people under 18 using ChatGPT (who weren't included in the sample at all), and a decent majority of OpenAI's users probably aren't old enough to remember the 20th century firsthand. ArsTechnica, 15 Sep. 2025 Even moderately keen cornering produces body roll and would bring doubtless admonition from the rear seats. Mike Duff, Car and Driver, 18 Aug. 2023 See All Example Sentences for doubtless

Word History

First Known Use

Adjective

15th century, in the meaning defined above

Time Traveler
The first known use of doubtless was in the 15th century

Browse Nearby Words

Cite this Entry

“Doubtless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/doubtless. Accessed 10 Jun. 2026.

Kids Definition

doubtless

1 of 2 adverb
doubt·​less ˈdau̇t-ləs How to pronounce doubtless (audio)

doubtless

2 of 2 adjective
: free from doubt : certain
doubtlessly adverb

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