Cool MateDefinitely vs Undoubtedly
When to use each in English, with meaning, register, and examples.
Definitely
Undoubtedly
| Definitely | Undoubtedly | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈdefɪnətli/"]/🇺🇸 /["/ˈdefɪnətli/"]/ | 🇬🇧 //ʌnˈdaʊtɪdli//🇺🇸 //ʌnˈdaʊtədli// |
| Meaning | For sure, without a doubt | Definitely; without a doubt. |
| Example | I definitely remember sending the letter. | She is undoubtedly the best candidate for the position. |
| Register | Neutral | Formal |
| How common | Top 1,000 (very common) | Top 5,000 (fairly common) |
| CEFR level | A2 | C1 |
| Part of speech | adverb | adverb |
| Collocations | definitely agree, definitely believe, definitely know | undoubtedly true, undoubtedly clear, undoubtedly helpful |
| Antonyms | doubtfully, uncertainly | doubtfully, questionably, uncertainly |
| Common mistakes | Often confused with 'defiantly' which means resisting authority., Sometimes spelled incorrectly as 'definately'. | Confused with 'undoubtably', which is incorrect., Omitting it when certainty is implied., Using it in informal contexts where 'definitely' is more suitable. |
| Usage notes | Use 'definitely' to emphasize certainty. It fits well in both spoken and written English. Avoid using it in overly formal contexts where alternatives like 'certainly' might be more suitable. | Used to emphasize certainty or strong belief; typically in formal writing or speeches, not common in casual conversation. |
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Frequently asked questions: Definitely vs Undoubtedly
What's the difference between Definitely and Undoubtedly?
Definitely: For sure, without a doubt Undoubtedly: Definitely; without a doubt.
Which is more formal: Definitely and Undoubtedly?
Undoubtedly is the most formal of these.
Which is more common: Definitely and Undoubtedly?
Definitely is the most common in everyday English.
Which is more advanced: Definitely and Undoubtedly?
Undoubtedly is the highest level, at C1, on the CEFR scale.
Are Definitely and Undoubtedly the same CEFR level?
Definitely: A2, Undoubtedly: C1 on the CEFR scale.
What part of speech are Definitely and Undoubtedly?
Definitely: adverb, Undoubtedly: adverb.
Can you show an example of each?
Definitely: I definitely remember sending the letter. Undoubtedly: She is undoubtedly the best candidate for the position.
Can I use Definitely and Undoubtedly interchangeably?
Not always. Definitely and Undoubtedly are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.