Which one should you use?
While sicuro describes the state of being sure, the related word certo is more commonly used as an interjection meaning 'of course' or 'sure!' when responding to a request. Additionally, if you want to say 'sure' in a formal way to emphasize agreement, you might use the phrase senza dubbio, which means 'without a doubt'.
Related words
How does it change in a sentence?
As an adjective, sicuro must agree in gender and number with the person or people who are sure: sicura for a feminine singular subject, sicuri for a masculine plural subject and sicure for a feminine plural subject. When expressing that you are sure about something, sicuro is typically followed by the preposition di.
How do you pronounce it?
The word has three syllables and the stress is on the second syllable: /siˈku.ro/.
When do people say it?
When responding to someone to reinforce agreement in an enthusiastic manner, you can use the phrase Sì, certo (meaning 'Yes, of course!').
Did you know?
- The English word 'secure' and the Italian word sicuro are distant cousins, both tracing back to the Latin 'securus', which meant 'without care' or 'free from anxiety'.
- In some regional contexts, sicuro! is used as a sarcastic retort. Depending on the tone, it can mean 'obviously' in a way that implies the other person is stating the blatant obvious.
- While sicuro can mean 'safe', the opposite of a 'safe place' is not non sicuro but pericoloso, meaning 'dangerous'. This creates a sharp linguistic divide between certainty and risk.
Examples in context
- Tom ne è sicuro.Tom is sure of that.This example shows how to use sicuro to express certainty about a fact.Tatoeba #6545167 by Guybrush88, translation #6532275 by CK
- Io ne ero sicuro.I was sure of it.This example demonstrates the use of sicuro in the past tense.Tatoeba #3830143 by Guybrush88, translation #2549368 by CK
- Era sicuro di sé.He was sure of himself.This example shows the use of sicuro when describing someone's self-confidence.Tatoeba #10058525 by Guybrush88, translation #7382604 by CH
- Vuoi venire al cinema stasera?
Certo!Do you want to come to the cinema tonight?
Sure! - Possiamo passare a prenderti alle 8?
Va bene!Can we pick you up at 8?
Sure! - Vuoi provare questo nuovo ristorante?
Assolutamente!Do you want to try this new restaurant?
Sure! - Possiamo organizzare una cena domani?
Sì, certo!Can we organize a dinner tomorrow?
Yes, of course! - Posso contare su di te per la riunione di domani?
Sicuramente!Can I count on you for tomorrow's meeting?
Sure! - 1388 more sentences on Tatoeba
Example conversation
Martina and Francesco are discussing a meeting time.
- MartinaSei sicuro che l'appuntamento sia alle tre?Are you sure the appointment is at three?
- FrancescoSì, ne sono sicuro.Yes, I am sure of it.
- MartinaAllora non ci sono dubbi.Then there are no doubts.
- FrancescoEsatto, tutto è confermato.Exactly, everything is confirmed.
Sources
- Wiktionary, “sure” translations and entries sicuro, CC BY-SA 4.0, dump of 2026-09-26.
- Word origins: Wiktionary entries sicuro, CC BY-SA 4.0.
- Example sentences: Tatoeba CC BY 2.0 FR.