She undoubtably excelled in her new role at the company.The artwork is undoubtably a testament to the artist's skill.Her dedication to the cause was undoubtably inspiring.
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Antonyms:
Undoubtedly
/ʌnˈdaʊtɪdli/
It is used to express certainty or agreement without any doubt.
Examples:
Life in Meryton was undoubtedly duller after the regiment had left.It is undoubtedly the blessed saints who stopped the train.'Undoubtedly,' assented Mr Podsnap;
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Antonyms:
Ways to tell them apart:
Undoubtedly is the more commonly accepted form of the word to express certainty without any reservations.
Undoubtably is considered a less common form and is often regarded as incorrect by many language authorities.
Remember: doubt is a noun and it better aligns with undoubtedly for easing memory recall no doubt equals undoubtedly.