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Definition of undoubtful

undoubtful

/ʌnˈdaʊtfəl/
un · doubt · ful
Adverb:undoubtfully
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undoubtful Lexical Profile

undoubtful Game Scores & Validity

• adjective

1

Not open to doubt or question; certain and indisputable.

Example

"The historical records provided undoubtful proof of the ancient treaty."

2

Free from doubt or suspicion; feeling assured and confident.

Example

"She remained undoubtful of her team's ability to complete the research project on time."

Synonyms
View all synonyms for undoubtful
Antonyms
View all antonyms for undoubtful

Word Nuance & Usage

In modern English, "undoubtful" is rare and largely superseded by "undoubted" (when describing a fact that is beyond question) or "confident" and "certain" (when describing a person who feels no doubt).

• Rhymes for undoubtful

• Nearby Words

undoubtable
undoubted
undoubtedly
undoubtful
undrainable
undrained
undramatic

Cite this Entry

Wordmom. (2026). Definition of Undoubtful. In Wordmom Dictionary. Retrieved Nov 3, 2026, from https://wordmom.com/dictionary/undoubtful
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