Definition of Sure
Quick Meaning of Sure
Feeling confident that something is true or will happen.
Detailed Definition of Sure
Confident or certain about something; having no doubt.
How to Pronounce Sure
Stress pattern: O (1-syllable word).
Tip: Sounds like 'shoor'. Some speakers pronounce it closer to 'sher'. The 'u' is the vowel sound in 'foot'.
Watch out: Sometimes pronounced as 'sho-wer' or confused with 'sugar'.
Origin and Etymology of Sure
From Old French 'seur', from Latin 'securus' (safe, free from care).
How to Use Sure in a Sentence
Each example shows “sure” with a CEFR level so learners can pick examples that match their fluency.
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“Are you sure you locked the door?”
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“I'm sure that she will pass her exam because she studied hard.”
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“The data makes us sure that our hypothesis is correct.”
Synonyms and Antonyms of Sure
Common Synonyms for Sure
Smart Synonyms for Sure — When to Use Each
- certain
- when you have definite knowledge or proof
- confident
- when feeling sure from experience
- convinced
- when someone has persuaded you to believe
Antonyms of Sure
Common Collocations with Sure
These phrases pair with “sure” in everyday English:
- make sure
- for sure
- sure enough
- sure about
- be sure of
Common Mistakes When Using Sure
Even fluent speakers slip up with “sure”. Here’s how to avoid the most common errors:
- ✗ Wrong: I am sure to know the answer.
- ✓ Correct: I am sure that I know the answer.
- Why: Use 'be sure that' for stating certainty; 'be sure to' means 'remember to do'.
- ✗ Wrong: She is sure if she will come.
- ✓ Correct: She is unsure if she will come.
- Why: Use 'sure' with positive statements, 'unsure' or 'not sure' for uncertain cases.
Words Confused With Sure
- Sure vs Safe: Safe means protected from danger; sure means confident or certain. Compare →
Other Forms of Sure
Frequently Asked Questions About Sure
What is the meaning of "Sure"?
Feeling confident that something is true or will happen.
How do you pronounce "Sure"?
The IPA is /ʃʊr/. Sounds like 'shoor'. Some speakers pronounce it closer to 'sher'. The 'u' is the vowel sound in 'foot'.
What part of speech is "Sure"?
"Sure" is an adjective at A1 level (Common European Framework).
What are synonyms for "Sure"?
Common synonyms include certain, confident, convinced.
How do you use "Sure" in a sentence?
For example: "Are you sure you locked the door?"