Immensely
Part of speech: adverb
Definition: Hugely; extremely; vastly.
Example sentence: The U.A.E. cannot be considered as any other nation as their rulers have underlined. Indians, especially Keralites, have contributed immensely in their nation building.
Vastly
Part of speech: adverb
Definition: Greatly, in a vast manner.
Example sentence: The capacity of human beings to bore one another seems to be vastly greater than that of any other animal.