What is a synonym for really?

There are many synonyms for "really," depending on the context and nuance you want to convey. Here are some examples:

For emphasis:

* Truly

* Absolutely

* Definitely

* Indeed

* In fact

* Actually

* Honestly

* Seriously

* For sure

* Without a doubt

For intensity:

* Very

* Extremely

* Incredibly

* Immensely

* Highly

* Deeply

For informal use:

* So

* Super

* Totally

* Right

* For real

For specific meanings:

* Authentically (genuine)

* Substantially (significantly)

* In truth (in reality)

The best synonym for "really" will depend on the specific sentence and the desired effect.