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Indubitably: A Closer Look at its Definition and Its Synonyms

by subhasree nag
Last Updated on: September 29, 2023

Have you ever been so sure and confident about something like the sun rising in the east or the grass being green but failed to find the proper word for it? Then here is the solution. This is the perfect fit for situations where doubtless or undoubtedly fail to express your exact thoughts. The word ‘indubitably’ is much stronger than doubtless or undoubtedly and does justice to your unshakable confidence.

This word is comparatively less used than other words, which closely relates to the word itself. But if you learn the correct use of it, then it can be a good addition to your vocabulary.


Indubitably defination

According to dictionary.com, indubitably is an adverb that means “in a way that is patently evident or certain, unquestionably; without doubt.” It means there is no doubt about something, or it is impossible to doubt as it is absolutely correct. It closely resembles the word doubtless or undoubtedly, but this one puts more emphasis or has more power in it.

This word is used in places where there is no room for error, where the fact can never be wrong. It can never be used where the fact has the tiniest bit chance of not being true and can turn out otherwise.


The word ‘indubitably’ is pronounced as ‘in-doo-bit-a-blee.’


It is used in places where the facts are absolutely correct, like some universal truth or if asked can be proved with facts and figures.

Origin of the word

Indubitably origin

The word has its origin in the Latin word “dubitabilis” which actually means doubtful. The word is then combined with the prefix-in, and then the meaning of the word becomes without any doubt. This word can only be used when you are 100% certain about something.

Dubitabilis originates from the Latin word dubitare, which means doubting something. This word started its use in Middle English in the 15th century.

Closely related words  

There are two words that closely related to the word indubitably are undoubtedly and doubtless.

Undoubtedly is often used as a synonym for the word indubitably. The word undoubtedly means where there is no doubt which is quite similar to the meaning indubitably holds.

This word originated from the French term douter in the mid-1400s. This means to be uncertain or doubtful. The prefix ‘un’ was then added to define the opposite of doubter and created the term we now know as undoubtedly. But somehow, the word indubitably holds more power.

Uses of the word undoubtedly:  

  • He was undoubtedly a talented singer but could not make it to the Bollywood industry.
  • The rumors undoubtedly changed the way she looked at him.
  • There is undoubtedly no connection between them.

Doubtless means where there is no space for doubt or when it is absolutely certain. Doubtless seems a bit less confident than the other two words.

  • It is doubtless that he will fail this semester.
  • I am doubtless that his style of teaching is making them frustrated.
  • I can doubtlessly say that because of these particular reasons, the match will get canceled.

These two words are quite similar to the word indubitably but still has got room for errors. Indubitably leave no room for errors and is used when there is absolute certainty. It works perfectly where there is proof of the fact that you are stating.

When to use the word indubitably? 

When to use the word indubitably

This word is not very popular colloquially and is mostly used for professional conversations. It is best used while stating facts or numbers to your clients or boss in a meeting. This can also be used in academic places.

When used in casual conversations, it might seem sarcastic and pretentious. It might seem like you are trying to roll over someone.

Let’s take a look at some examples.  

  • The driver is indubitably tired and sleepy, he should pull over and freshen up.
  • The answer was indubitably correct, as he got the numbers to prove it.
  • There is indubitably no way to continue this experiment.
  • He is indubitably overqualified for the position he has applied for.
  • The judge gave the verdict based on the footage the lawyer presented, and it is indubitably correct.
  • This word can also be used to answer questions.

Jack: Is this going to work if we change the strategy?

Jill: Indubitably.


Synonyms of indubitably

Informal synonyms include:

  • No Doubt
  • For sure
  • Without a doubt
  • Hundred percent correct

Formal synonyms are:

  • Certainly
  • Absolutely
  • Indisputably
  • Irrefutably
  • Inarguably
  • Undoubtedly
  • Positively
  • Veritably
  • Unquestionably

Example sentences with synonyms of ‘Indubitably’


  • Dean planned to telephone Fred directly from Willoughby’s to make absolutely sure no inquisitive eavesdropper could arrive at the bar before he was securely in place.
  • He made his reasons for resigning absolutely clear.
  • Conceal nothing from me, I wish to know absolutely how things are.


  • I require veritable proof.
  • My garden had become a veritable jungle by the time I came back from holiday.
  • Though small, this museum is a veritable treasure trove of history.


  • Several experiments were tried, to determine positively whether or not she had any perception of sound.
  • The instructions were not just confusing, they were positively misleading.
  • The blood was never positively identified as the victim’s.


  • She was undoubtedly the best candidate.
  • She was undoubtedly a very striking young woman.
  • There is undoubtedly a great deal of corruption in football.
  • She undoubtedly had a great influence on me.


  • While the health benefits of oatmeal may be irrefutable, the taste might not appeal to everyone.
  • You only have to have reasonable suspicion and not irrefutable evidence to support your concerns.
  • The pictures and videos provide irrefutable evidence of the incident.


  • Of the two brothers, Friedrich was unquestionably the more original genius.
  • Three unquestionably great innings were played within the space of four months.
  • The Eiffel Tower is unquestionably one of Paris’s most familiar landmarks.


  • This is inarguably great art, but for now, the lyrics are heartbreaking.
  • Among all the major professional sports, football is inarguably the best.
  • While Artificial Intelligence is inarguably impressive, the idea of using AI in everyday life makes me a little nervous.


  • It is indisputable that the crime rate has been rising.
  • This is indisputably, the work of a genius.
  • The Internet has changed the world, it is an indisputable fact.


  • The public is certainly getting tired of hearing about it.
  • That was certainly a surprising turn of events!
  • If this was love, it was certainly a dangerous love.

Places where indubitably and undoubtedly can be used interchangeably.

  • She is indubitably more qualified for this work./She is undoubtedly more qualified for this work.
  • The messed up paperwork indubitably proved her impotency for this work./The messed up paperwork undoubtedly proved her impotency for this work.

Words that are similar to indubitably:

  • Probable
  • Likely
  • Irrefutable
  • Evidently
  • Undeniable
  • Inarguable
  • Undebatable


It is necessary to keep in mind that the word has got the power to prove the facts correct. So it should be used in places where no one will be able to point out that this fact can be changed or it might not be true. There is also an adjective form of the word that is indubitable. For example, “ there are indubitable benefits of wearing a mask.” Just make sure the sentence where you are putting the word cannot be questioned.

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