I am completely certain

USAGE SUMMARY

The phrase "I am completely certain" is correct and usable in written English.
You can use it when expressing strong confidence or assurance about a particular statement or belief. Example: "After reviewing all the evidence, I am completely certain that we made the right decision."

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified similar examples from authoritative sources

Similar Expressions

59 human-written examples

Not that I was completely certain what "it" was.

The Guardian - Lifestyle

In fact, I'm completely certain she doesn't.

Vice

When I was completely certain I wasn't going to see the horror show I had hoped for, I decided to talk to this guy, who seemed to be the group's most articulate spokesman, even though he wanted to remain nameless.

Vice

The rule of maximizing expected utility leads now to an extremely conservative policy: the best hypotheses \(g\) on \ e\) are those that satisfy \(P(g\mid e) = 1\), i.e., are completely certain on \ e\) (e.g. \ e\) itself and tautologies).

SEP

Accordingly, the uncertainty is least if occupancy of exactly one state is completely certain (i.e., with probability equal to unity, corresponding to zero entropy), whereas the uncertainty is greatest for a uniform probability distribution over all the available states (i.e., with all states being equiprobable, e.g., having a probability of half unity for each state in a two-state system).

BioMed Research International

Are we really sure this is our seam attack for the Ashes?" I don't think we're completely certain about Broad or Finn, but all things being equal they will be in the team.

The Guardian - Sport

As a viewer, I wondered how the crew in Tunis could be completely certain that a stranger found so rapidly and speaking in translation phrases of a generalised kind –the guy used to "drink and gamble" with them before being "radicalised" – really had known the terrorist well.

The Guardian - TV & Radio

I am used to choreography, moral absolutes and a crowd that is completely certain about everything.

The Guardian

And I think that there is enough going on these that one can't be completely certain what is being represented at any point in time.

eLife

A central bank does not need to be completely certain to act.

The Economist

Rejecting the denial, Vice President Francisco Santos said the government "is completely certain that it was the FARC".

The New York Times

Expert writing Tips

Best practice

Use "I am completely certain" when you want to express a strong conviction or assurance about something. It conveys a higher level of confidence than simply saying "I think" or "I believe".

Common error

Avoid overusing "I am completely certain", as it can make your writing sound repetitive or arrogant. Use it sparingly to emphasize key points, and vary your language with synonyms like "I am sure", "I have no doubt", or "I am convinced".

Linguistic Context

The phrase "I am completely certain" functions as a declarative statement expressing the speaker's strong conviction or assurance. As Ludwig AI confirms, it is grammatically sound and serves to emphatically convey certainty about a particular matter. Similar examples show the speaker expressing their conviction.

Expression frequency: Common

Frequent in

News & Media

35%

Science

33%

Wiki

32%

Less common in

Formal & Business

0%

Academia

0%

Encyclopedias

0%

Ludwig's WRAP-UP

In summary, "I am completely certain" is a grammatically correct and commonly used phrase for expressing a high degree of confidence. According to Ludwig AI, it's suitable for various contexts, though best practices suggest using it judiciously to avoid sounding repetitive. While versatile, being mindful of the surrounding tone will ensure the phrase adds impact without sounding overly assertive. There are several alternatives available, allowing for nuanced expression of certainty.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I am absolutely sure

Uses "absolutely sure" instead of "completely certain" to convey the same level of confidence.

I am one hundred percent sure

Emphasizes certainty by quantifying it as one hundred percent.

I have no doubt

Expresses certainty by indicating a lack of doubt.

I am positive

Replaces "completely certain" with "positive", indicating strong conviction.

I am fully convinced

Uses "fully convinced" to suggest a complete state of persuasion.

I am utterly confident

Substitutes "completely certain" with "utterly confident", emphasizing the extent of confidence.

I am firmly of the opinion

Indicates a strong belief or judgement regarding something.

Without a doubt, I believe

Adds emphasis to the belief, expressing confidence.

I can assure you

Offers reassurance and confidence in a particular outcome or statement.

I guarantee

Provides a guarantee, suggesting a very high degree of certainty.

FAQs

What does "I am completely certain" mean?

It means you have no doubts about something and are very sure about it. It expresses a strong level of confidence.

What are some alternatives to "I am completely certain"?

You can use alternatives like "I am absolutely sure", "I have no doubt", or "I am positive" depending on the context.

Is it okay to use "I am completely certain" in formal writing?

Yes, it's acceptable in formal writing, but consider the tone. Ensure it doesn't come across as overly assertive. Phrases like "I am fully convinced" may sound more appropriate in certain formal contexts.

How does the strength of "I am completely certain" compare to "I am certain"?

"I am completely certain" is stronger. The addition of "completely" intensifies the feeling of certainty, suggesting a higher degree of confidence than simply saying "I am certain".