Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
thought for sure
Grammar usage guide and real-world examplesUSAGE SUMMARY
"thought for sure" is correct English and can be used in written English.
For example, "I thought for sure I'd gotten the job, but then they went with someone else."
✓ Grammatically correct
News & Media
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
59 human-written examples
"I thought for sure.
News & Media
I thought for sure it was bird shit.
News & Media
The policeman thought for sure I was dead.
News & Media
Everyone thought for sure that my amnesia would be temporary.
News & Media
I thought for sure I was gonna make it".
News & Media
"I thought for sure I was gone to the minors.
News & Media
"She thought for sure she'd be getting a pashmina scarf".
News & Media
"I thought for sure I was going to die".
News & Media
I thought for sure I was going to win that.
News & Media
And the neighbors thought for sure we were all gone.
News & Media
"I thought for sure that he had been hit.
News & Media
Expert writing Tips
Best practice
Use "thought for sure" to convey a sense of strong belief or expectation, but be mindful of the context. It's suitable for informal communication and narratives where a character expresses their assumptions. In formal writing, consider more precise alternatives like "was certain" or "fully expected".
Common error
While "thought for sure" is acceptable, avoid overusing it in formal writing. Over-reliance can make your writing sound less professional. Mix it up with alternatives like "was convinced" or "believed strongly" to maintain a sophisticated tone.
Source & Trust
91%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "thought for sure" functions as a qualifier expressing a strong belief or expectation. As indicated by Ludwig, it typically precedes a statement that either confirms or contradicts that initial belief. The phrase serves to emphasize the speaker's prior conviction.
Frequent in
News & Media
100%
Less common in
Science
0%
Formal & Business
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "thought for sure" is a common and grammatically sound way to express a strong belief or expectation. Ludwig's analysis shows that the phrase is acceptable for use in English writing, with plenty of examples found in news and media. While its use is more suited to neutral or informal contexts, it effectively conveys certainty. When aiming for more formal expression, consider alternatives like "was certain" or "fully expected". As confirmed by Ludwig, the phrase is a versatile tool for expressing beliefs, provided it aligns with the intended tone and audience.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
was certain
Emphasizes a strong conviction or lack of doubt, replacing the more conversational "thought for sure".
was convinced
Highlights the state of being persuaded or completely sure about something.
fully expected
Focuses on the anticipation of an event with a high degree of confidence.
had no doubt
Expresses a firm belief without any reservations.
believed without question
Stresses the unquestioning nature of the belief, making it absolute.
was under the impression
Indicates a belief based on incomplete or possibly incorrect information; less certain than "thought for sure".
assumed as a given
Presents the belief as a foundational assumption that requires no further proof.
took it for granted
Implies the belief was so strong it was never questioned or considered.
presumed confidently
Highlights the confident manner in which the assumption was made.
anticipated with certainty
Focuses on the anticipation of an event coupled with a strong feeling of sureness.
FAQs
What does "thought for sure" mean?
The phrase "thought for sure" means to have believed something with a high degree of confidence or certainty. It implies an expectation that something would happen or be true, often followed by a situation where the expectation was either met or not met.
Is "thought for sure" grammatically correct?
Yes, "thought for sure" is grammatically correct and commonly used in spoken and written English, especially in informal contexts. Ludwig confirms this with numerous examples from reliable sources.
What are some alternatives to "thought for sure"?
You can use alternatives such as "was certain", "was convinced", or "fully expected" depending on the level of formality and the specific nuance you want to convey.
How can I use "thought for sure" in a sentence?
You can use "thought for sure" to express a prior belief or expectation, as in "I thought for sure I had locked the door" or "She thought for sure she would get the job after the interview".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
91%
Authority and reliability
4.5/5
Expert rating
Real-world application tested