What is a synonym for hilarious?

Here are some synonyms for hilarious, depending on the context:

Formal:

* Amusing

* Comical

* Side-splitting

* Rib-tickling

* Hilarious

Informal:

* Funny

* Screamingly funny

* Gut-busting

* Hysterical

* A riot

* A hoot

* Cracking up

* Wacky

* Absurd

Stronger:

* Roar with laughter

* Fall-on-the-floor funny

* Uproarious

* Side-splittingly funny

The best synonym to use depends on the specific situation and the level of formality you want to convey.