indubitably

American  

[in-doo-bi-tuh-blee, in-dyoo‐] / ɪnˈdu bɪ tə bli, ɪnˈdyu‐ /

adverb

1. in a way that is patently evident or certain; unquestionably; without doubt.

   A week at the spa has indubitably improved his health.

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indubitably British  

/ ɪnˈdjuːbɪtəblɪ /

adverb

1. without doubt; certainly

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Etymology

Origin of indubitably

First recorded in 1620–30; indubitable ( def. ) + -ly ( def. )

Explanation

Indubitably means "without doubt." If you say that you are indubitably going to run for class president, you're sure of it. With five syllables, indubitably is kind of a mouthful. Here's how to say it: "in-DOO-bit-a-blee." And while it is more of an old-fashioned adverb, indubitably remains a unique way to say "undoubtedly." In fact, doubt and indubitably share a root in the Latin word dubitabilis, meaning "doubtful." Adding the prefix in- makes something done indubitably without a doubt.

Example Sentences

As “Deliver Me from Nowhere” makes indubitably clear, Springsteen’s artistic confidence is buoyed by his career-making partnership with Jon Landau.

From Salon • Oct. 24, 2025

The question will need to be answered by understanding the only subjectivity we are indubitably confident of: our own.

From Scientific American • Sep. 8, 2023

In the process, they have created a stadium that does, indeed, feel indubitably SoCal — a place that is both indoors and out, a place where intimate experiences can be had amid the industrial scale.

From Los Angeles Times • Feb. 8, 2022

Now, with performances and exhibitions canceled for the foreseeable future, they are all collectively — indubitably — in full-blown crisis.

From New York Times • May 12, 2020

A lot of people point out in defense of the national parks that they have been starved of funds, and this is indubitably so.

From "A Walk in the Woods" by Bill Bryson