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sure

confident / certain / reliable

/ʃoː/

AdjectiveAdverb

The word carries a feeling of stability and absence of doubt. When referring to personal confidence, it is more casual than 'certain' or 'convinced', often used in rapid-fire dialogue to verify facts. In the context of reliability, it describes an inevitable outcome. It suggests a causal link that cannot be broken, such as a "sure thing" in gambling or a "sure sign" of a change in weather. As an adverb, it takes on a colloquial, often regional (North American) tone. In this usage, it functions less as a statement of fact and more as a tool for emotional emphasis, similar to 'really' or 'definitely'.

💬Casual Conversation

🎬Tuesday afternoon, Jessica is staring at a chaotic Gantt chart while David is in a golf meeting.
Jessica

The client wants the slide deck by 4. Are you sure we can swing that?

Jessica
David
David

Sure thing. Just pivot the focus to the KPIs and it'll be a breeze.

💡
Jessica uses 'sure' to express her anxiety-driven doubt about a deadline, while David responds with 'Sure thing' (a common idiom for 'certainly') and uses corporate buzzwords like 'pivot' and 'KPIs' to mask the fact that he isn't actually helping with the work.

Meanings

Adjectiveconfident

Confident in one's own knowledge, opinion, or ability; certain.

"Are you sure that the train leaves at five?"

Adjectivecertain

Reliable or guaranteed to happen.

"It is a sure sign of spring when the daffodils bloom."

Adverbreliable

Used for emphasis, meaning 'certainly' or 'surely'.

"That sure was a delicious meal."

Collocations & Compounds

make sure

To ensure that something is the case or that a particular outcome is achieved.

sure sign

An unmistakable indication that something is true or about to happen.

for sure

Without any doubt; certainly.

sure bet

Something that is almost certain to happen or succeed.

sure thing

A certainty; also used as an informal way of saying 'yes' or 'you are welcome'.

Idioms & Sayings

sure thing

A certainty; something that is guaranteed to happen.

make sure

To ensure that something happens or is true.

for sure

Without any doubt; certainly.

sure fire

Certain to succeed; guaranteed.

Etymology

Derived from Old French 'sur', meaning 'safe, secure, certain', which originates from the Latin 'securus' (from 'se-' 'without' + 'cura' 'care/anxiety'). It entered Middle English in the 14th century.

Related Words

Last Updated: June 12, 2026Report an Error