Cool MateCertainly vs Definitely vs Indeed vs Sure i hate olives vs Surely
When to use each in English, with meaning, register, and examples.
Certainly
Top 1,000 (very common)A2adverb
Definitely
Top 1,000 (very common)A2adverb
Indeed
Top 1,000 (very common)B1adverb
Sure i hate olives
InformalTop 2,000 (common)
Surely
Top 2,000 (common)B1adverb
| Certainly | Definitely | Indeed | Sure i hate olives | Surely | |
|---|---|---|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈsɜːtnli/"]/🇺🇸 /["/ˈsɜːrtnli/"]/ | 🇬🇧 /["/ˈdefɪnətli/"]/🇺🇸 /["/ˈdefɪnətli/"]/ | 🇬🇧 /["/ɪnˈdiːd/"]/🇺🇸 /["/ɪnˈdiːd/"]/ | 🇬🇧 //ʃʊə//🇺🇸 //ʃʊr// | 🇬🇧 /["/ˈʃʊəli//ˈʃɔːli/"]/🇺🇸 /["/ˈʃʊrli/"]/ |
| Meaning | Definitely; for sure. | For sure, without a doubt | Yes, really; for sure. | When you are definitely sure about something. | certainly; without a doubt |
| Example | Without treatment, she will **almost certainly** die. | I definitely remember sending the letter. | Indeed, the project is going much better than we expected. | Sure, I hate olives! | Surely we should do something about it? |
| Register | Neutral | Neutral | Neutral | Informal | Neutral |
| How common | Top 1,000 (very common) | Top 1,000 (very common) | Top 1,000 (very common) | Top 2,000 (common) | Top 2,000 (common) |
| CEFR level | A2 | A2 | B1 | - | B1 |
| Part of speech | adverb | adverb | adverb | adverb | |
| Collocations | certainly agree, certainly possible, certainly not, certainly true, certainly yes | definitely agree, definitely believe, definitely know | indeed true, indeed a fact, as you said, indeed | sure thing, sure about, sure of oneself | surely believe, surely know, surely must |
| Antonyms | uncertainly, doubtfully | doubtfully, uncertainly | disregarding, neglecting | - | doubtfully, unsure |
| Common mistakes | 'Certainly' is often incorrectly used in place of 'certain' in adjectives., Learners might confuse 'certainly' with 'definitely' without noticing the subtle nuance., Some learners use 'certainly' in inappropriate contexts, such as casual greetings. | Often confused with 'defiantly' which means resisting authority., Sometimes spelled incorrectly as 'definately'. | Using 'indeed' in extremely casual texts, where 'yes' would be more appropriate., Confusing 'indeed' with 'instead' — they have different meanings., Placing 'indeed' too far from what it modifies, making it unclear. | Using 'sure' incorrectly in formal contexts., Confusing 'sure' with 'certain'., Neglecting to use contractions like 'I’m' instead of 'I am' in casual speech. | 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 'certainly' when you want to emphasize affirmation or agreement. It is more formal than 'sure' and works well in professional settings, but might feel too strong in casual conversations. | 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 confirm something previously mentioned. Normal in both spoken and written English, but less common in very casual conversations. | Used casually in conversations to express confidence or certainty; not suitable for formal writing. | 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: Certainly vs Definitely vs Indeed vs Sure i hate olives vs Surely
What's the difference between Certainly, Definitely, Indeed, Sure i hate olives, and Surely?
Certainly: Definitely; for sure. Definitely: For sure, without a doubt Indeed: Yes, really; for sure. Sure i hate olives: When you are definitely sure about something. Surely: certainly; without a doubt
Can you show an example of each?
Certainly: Without treatment, she will **almost certainly** die. Definitely: I definitely remember sending the letter. Indeed: Indeed, the project is going much better than we expected. Sure i hate olives: Sure, I hate olives! Surely: Surely we should do something about it?
Can I use Certainly, Definitely, Indeed, Sure i hate olives, and Surely interchangeably?
Not always. Certainly, Definitely, Indeed, Sure i hate olives, 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.