Cool MateDefinitely vs Surely
When to use each in English, with meaning, register, and examples.
Definitely
Top 1,000 (very common)A2adverb
Surely
Top 2,000 (common)B1adverb
Most common: Definitely
| Definitely | Surely | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈdefɪnətli/"]/🇺🇸 /["/ˈdefɪnətli/"]/ | 🇬🇧 /["/ˈʃʊəli//ˈʃɔːli/"]/🇺🇸 /["/ˈʃʊrli/"]/ |
| Meaning | For sure, without a doubt | certainly; without a doubt |
| Example | I definitely remember sending the letter. | Surely we should do something about it? |
| Register | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 2,000 (common) |
| CEFR level | A2 | B1 |
| Part of speech | adverb | adverb |
| Collocations | definitely agree, definitely believe, definitely know | surely believe, surely know, surely must |
| Antonyms | doubtfully, uncertainly | doubtfully, unsure |
| Common mistakes | Often confused with 'defiantly' which means resisting authority., Sometimes spelled incorrectly as 'definately'. | Confusing 'surely' with 'sure' — 'sure' can be an adjective., Using 'surely' as a response when a simple 'yes' would suffice., Omitting 'surely' in a sentence where it clarifies certainty. |
| 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. | Use 'surely' to express certainty. It’s appropriate in both spoken and written contexts but is more common in formal discussions. Avoid using it in very casual conversations where simpler words like 'definitely' might fit better. |
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Frequently asked questions: Definitely vs Surely
What's the difference between Definitely and Surely?
Definitely: For sure, without a doubt Surely: certainly; without a doubt
Which is more common: Definitely and Surely?
Definitely is the most common in everyday English.
Which is more advanced: Definitely and Surely?
Surely is the highest level, at B1, on the CEFR scale.
Are Definitely and Surely the same CEFR level?
Definitely: A2, Surely: B1 on the CEFR scale.
What part of speech are Definitely and Surely?
Definitely: adverb, Surely: adverb.
Can you show an example of each?
Definitely: I definitely remember sending the letter. Surely: Surely we should do something about it?
Can I use Definitely and Surely interchangeably?
Not always. Definitely and Surely 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.