What is the superlative form of word send?

The word "send" doesn't have a superlative form. Superlatives are used to describe the highest degree of something, and "send" is an action verb.

You could use a superlative adjective to describe the way something is sent, such as:

* "The fastest send"

* "The most efficient send"

* "The most secure send"

But "send" itself doesn't have a superlative form.