Italian Phrase
Non sono sicuro.
Meaning
This phrase is used to express uncertainty or doubt about a specific situation, fact, or decision. It is the negative form of 'sono sicuro' (I am sure). The word 'sicuro' functions as an adjective and must agree in gender with the speaker.
When to use
Use this phrase when someone asks for your opinion or a fact and you aren't 100% certain of the answer. It is appropriate for both formal and informal settings.
✦Grammar Breakdown
Nonsonosicuro
Non
The standard Italian negation word, always placed immediately before the verb.
Sono
The first-person singular present tense of the verb 'essere' (to be).
Sicuro
An adjective meaning 'sure' or 'certain' that changes to 'sicura' if the speaker identifies as female.
🗨In Conversation
Il treno parte alle otto?
Does the train leave at eight?
Non sono sicuro, controlliamo l'orario.
I'm not sure, let's check the schedule.
✕Common Mistakes
Io non ho sicuro.
Use the verb 'essere' (to be) instead of 'avere' (to have) to express certainty.
Non sono sicura.
The adjective ending must match the speaker's gender; a male speaker must use 'sicuro'.
↔Alternatives
Non ne sono certo.
I'm not certain about it.
Non saprei.
I wouldn't know / I'm not sure.
Boh!
I don't know (very informal).
Cultural Tip
In Italy, expressing uncertainty is common and often accompanied by a slight shrug or a specific hand gesture. While 'Non sono sicuro' is standard, younger generations frequently use 'Boh' in very casual contexts to express a complete lack of knowledge.