How do you say really in welsh?

"Really" in Welsh can be translated in a few different ways, depending on the context and nuance you want to convey:

Formal:

* Yn wir: This is the most literal translation and is generally used in formal settings.

* Mewn gwirionedd: This is another formal option, meaning "in truth."

Informal:

* Go iawn: This is the most common and informal way to say "really."

* Yn wir: While technically formal, this is also used in informal settings.

* O ddifri: This means "seriously," but can be used in a similar way to "really."

Other options:

* Meistrol: This means "master" and can be used to express surprise or disbelief, similar to "really!"

* Yn wir: This can be used in a similar way to "indeed" in English.

The best way to choose the right translation depends on the specific situation. Consider the formality of the situation and the tone you want to convey.