Estou convicto

You use it just like 'I am sure.' Follow it with de que to explain what you are sure about. For example, Estou convicto de que vai chover. If you are a woman, remember to change it to Estou convicta. Portuguese grammar loves its gender agreement. It works perfectly in professional settings or serious debates. It makes you sound confident and articulate.

Use it when you want to sound persuasive. It is great for job interviews. Use it when discussing a project at work. It also works in deep late-night talks with friends. If you are arguing about which football team is better, this adds weight. It shows you aren't just talking; you have a strong opinion.

Don't use it for trivial things. If someone asks if you want pizza, don't say Estou convicto. That sounds way too dramatic. It is like wearing a tuxedo to a beach party. Avoid it in very slang-heavy conversations. It might make you sound a bit stiff. Also, don't use it if you have even a tiny doubt. It implies 100% certainty.

Portuguese culture values passion and firm stances. Being convicto is seen as a sign of character. It suggests you are a person of principles. Historically, it carries a weight of intellectual or moral certainty. It is a word often heard in political speeches or classic literature. It reflects the serious side of the Lusophone soul.

You will often hear Tenho a convicção. This means 'I have the conviction.' Another common one is Estou plenamente convicto. Adding plenamente is like adding a double shot of espresso to your certainty. It means you are 'fully' convinced. In casual speech, people might just stick to Tenho certeza, but convicto is your upgrade for when you want to impress.