General:
* All - This is the most straightforward synonym, meaning "the whole amount or number."
* Each and every - This emphasizes individual items within a group.
* Whole - This refers to the entirety of something, often in a physical sense.
* Total - This emphasizes the sum of all parts.
* Every single thing - This is similar to "each and every" but emphasizes individual items more.
* All things considered - This focuses on a complete assessment of a situation.
Formal:
* Totality - This is a more formal synonym for "everything."
* Entirety - This emphasizes the wholeness of something.
Informal:
* The whole shebang - This is a casual expression for "everything."
* The whole kit and caboodle - This is another casual expression for "everything."
The best synonym for "everything" will depend on the specific context and tone you want to achieve.