The analysis of "The loneliness one dare not sound"

please help me out with the analysis of the following poem by EMILY DICKINSON

The Loneliness One dare not sound

The Loneliness One dare not sound
And would as soon surmise
As in its Grave go plumbing
To ascertain the size

The Loneliness whose worst alarm
Is lest itself should see
And perish from before itself
For just a scrutiny

The Horror not to be surveyed
But skirted in the Dark
With Consciousness suspended
And Being under Lock

I fear me this is Loneliness
The Maker of the soul
Its Caverns and its Corridors
Illuminate or seal

You'll need to consider definitions of some of the words that may not be the first ones that come to your mind.

"Sound" does not mean something that you hear in this case, but the process of measuring the depth of something.

"Plumbing" does not refer to flushing toilets, but is used to pertain, again, to measurement.

What is this poem saying about loneliness? What does the poem say about self analysis?

You have to analyze it according to the criteria from class... what are they teaching?
What are the literary terms you are studying?