Grammer

[parya1986]

What is the superlative form of beneath?

[engee30]

What is the superlative form of beneath?

There's no such form, I'm afraid.

Just to your knowledge, I'm not a teacher.

[Teia]

What is the superlative form of beneath?

Beneath is an adverb meaning below. It does not have a superlative form. You can use a synonym instead :

to a lower place, to the lowerest place [ on Earth], etc. It depends on the context you want to use it in.

Beneath means inferior or less important, as in position, rank, or power, as well.
e.g.

A captain is beneath a major.
beneath - Definitions from Dictionary.com

His rank is the least important of all ranks...
What is the context?