Meaning & use
undoubtable
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Meanings
adjectivenot comparablerare
So certain that no one could reasonably question it.
Grammar: Used before a noun or after a linking verb: an undoubtable fact; the fact is undoubtable.
Patterns
- an undoubtable fact
- an undoubtable truth
- it is undoubtable that …
The benefit of clean water to public health is undoubtable.
Her talent was undoubtable, and every coach said so.
It is undoubtable that the team worked hard this season.
adjectivenot comparablerareformal
Not able to be doubted or called into question by anyone.
Grammar: More often used of evidence or proof than of people; it rarely describes a person directly.
Patterns
- undoubtable evidence
- undoubtable proof
The lawyers presented undoubtable proof that the signature was forged.
There was undoubtable evidence linking the two events.
Common combinations
- undoubtable fact
- That the earth orbits the sun is an undoubtable fact.
- undoubtable proof
- The video gave undoubtable proof of what really happened.
- undoubtable evidence
- Scientists need undoubtable evidence before they accept a new theory.
- seem undoubtable
- At the time, the company's success seemed undoubtable.
Synonyms and how they differ
- undeniable
- This is the everyday word for the same idea and sounds natural in almost any context, while undoubtable sounds old-fashioned and rare.
- indisputable
- Stronger and more formal; it suggests that no one could even argue against it, often used of facts and records.
- certain
- Much more common and general; it can describe a person's feelings as well as facts, which undoubtable cannot.
- unquestionable
- Close in meaning, but it often carries a tone of moral or official authority rather than simple certainty.
Opposites
Word family
- doubt verb
- to feel unsure about whether something is true.
- doubtful adjective
- not likely to be true or not feeling sure.
- undoubtedly adverb
- used to say that something is certainly true, and far more common than undoubtable.
- doubtless adverb
- almost certainly; a slightly literary way to express the same certainty.
Commonly confused: undoubtable or undoubted? undoubtable or undoubtedly?
undoubtable vs undoubted
Undoubted also means not questioned, but it usually comes before a noun, as in her undoubted skill, while undoubtable is rarer and more often follows a linking verb.
undoubtable vs undoubtedly
This is an adverb, not an adjective: say it is undoubtable that …, but say he is undoubtedly right.
Practice
Which sentence uses undoubtable correctly?
Choose one answer.
Undoubtable is an adjective that describes things like evidence or facts, so 'undoubtable evidence' fits. Option 2 needs the adverb undoubtedly, option 3 needs an adjective like sure or certain after 'was', and option 4 needs an adverb or a verb form.
Make it your own
Write a sentence using “undoubtable”, then check it and compare it with the examples above.