C1adverbformal5K

Undoubtedly

UK //ʌnˈdaʊtɪdli//US //ʌnˈdaʊtədli//

Definition

In a way that is certain or without doubt.

In simple words: Definitely; without a doubt.

Examples

She is undoubtedly the best candidate for the position.
Undoubtedly, this will lead to significant improvements.
He undoubtedly performed well in the exam.
The results are undoubtedly promising for future research.
Undoubtedly, technology has changed our lives significantly.

Usage notes

Used to emphasize certainty or strong belief; typically in formal writing or speeches, not common in casual conversation.

Grammar pattern

standalone adverb

Memory hint

Think of 'undoubtedly' as 'doubt-free'—no doubt about it!

Collocations

undoubtedly true
undoubtedly clear
undoubtedly helpful

Synonyms

certainly
definitely
indubitably
unquestionably
assuredly

Antonyms

doubtfully
questionably
uncertainly

Common mistakes

Confused with 'undoubtably', which is incorrect.
Omitting it when certainty is implied.
Using it in informal contexts where 'definitely' is more suitable.