What is a synonym for very large?

Here are some synonyms for "very large," depending on the context and desired nuance:

General:

* Huge

* Immense

* Vast

* Enormous

* Gigantic

* Colossal

* Mammoth

* Extensive

* Grand

* Monumental

For numbers:

* Tremendous

* Substantial

* Significant

* Considerable

For size or quantity:

* Abundant

* Profuse

* Bountiful

* Ample

* Overflowing

For area or space:

* Sprawling

* Expansive

* Broad

* Wide

For weight or volume:

* Heavy

* Bulky

* Massive

The best synonym to use will depend on the specific situation.