Extending beyond "average"
This is an English question, jeje 
We are familiar with the terms "average", "below average", and "above average", but what about when we want to extend past those terms?
For example:
On that bell curve, they are talking about people and their intelligence levels. In my situations, I am not talking about people, and thus, "very bright" and "very dull" would not fit this case.
Any suggestions for the areas highlighted in green?
Gracias a todos 
7 Answers
How about superior and inferior?
Hi Sonrisa! This is an intriguing question. Without knowing what you are measuring, it's difficult to choose an exact match, but each of the areas shaded in green is an extreme. Therefore I would look for synonyms of "extreme," such as: greatest/least; maximum/minimum or maximal/minimal; enormous/miniscule etc.
Other words which describe extremes (at either end) are: ultra; unparalleled; radical or radically; utter or utterly; acute/acutely; rare/rarely; drastic/drastically; supreme/supremely; intense/intensely; excessive/excessively; exceeding/exceedingly.... well, you get the point
Or, in the case of percentages, you could say "9_th percentile" or "in the top 10%" or "close to 100%" for the high range vs. "negligible" for the low range. Hope this helps!
Above superior, we say "Sun Smile."
I've heard
-Muy por debajo de la media.
-Muy por encima de la media.
Below, would be referred to as 'a couple fries short of a happy meal.' Above green, 'ridiculously smart.'
You don't mind a little humor now, do you?
Above or below "par " If " par " is the average.
The extremities of the bell curve could be be described with adjectives such as very..., most, highly, least, lowest, best, worst. Depending on the subject.
