pattern - What is a Refreshing Word™?

If a word conforms to a special rule, I call it a Refreshing Word™.

Use the following examples below to find the rule.

And here is a CSV version:

REFRESHING WORD™, UNREFRESHING WORD™
Hungrier, Hungriest
Refreshing, Reforming
Noon, Undeniable
Unsung, Poop
Deadly, Deathly

Barbie, Nincompoop

Before you ask, it's not the fact that all the Refreshing Words™ have a pair of letters that are 2 characters apart; that was just there to throw you off. Think inside the box.

Answer

An Unrefreshing Word

Is one that contains, potentially anagrammed, a verb describing an action pertaining to bodily fluids

Examples:

Hungriest -> Shit, Reforming -> Gore, Undeniable->Bleed, Poop->Poop, Deathly->Eat, Nincompoop->Poop

A Refreshing Word, is then any word that is not Unrefeshing

A big thank you to Maria Deleva in the chat, coming up with Hungriest and Undeniable.