Noun : the gnawings of hunger.    From Dictionary.com. 

The whole thing does rather give one a gnawingly ill feeling in the pit of the stomach.    From Wordnik.com.  [A Critical Glitch « XUP] Reference

Most of Amanda's concern had to do with Lucy, although a disruption, of her own privacy was a gnawingly discomfiting prospect.    From Wordnik.com.  [Wyoming Territory]

But as with the loss of Gildas father three years earlier, also at age sixty-five, it was a blow that was deeply and gnawingly upsetting without, somehow, being devastating.    From Wordnik.com.  [A Question of Honour] Reference

Marco was by this time rather gnawingly hungry himself.    From Wordnik.com.  [The Lost Prince] Reference

The fist-gnawingly awful remake is regularly voted the worst cover of all time.    From Wordnik.com.  [NEWS.com.au | Top Stories] Reference

There is no sorrow that a child can bear, keener and more gnawingly bitter than this.    From Wordnik.com.  [Daisy] Reference

Hast thou heard the fall of water-drops in deep caves, where heavily, and perpetually, and gnawingly, they eat into the ground on which they fall?.    From Wordnik.com.  [Strife and Peace] Reference

It is a teeth-gnawingly tense moment, because by swaggering but then sneaking around in an apparently empty house, Steve has suddenly put himself in the wrong.    From Wordnik.com.  [Film | guardian.co.uk] Reference

In Ian's contact with Kurt, Cobain had nothing to say about the portrayal of him in Gus Van Sant's Last Days, possibly because it was so arse-gnawingly boring that even Kurt himself didn't sit through the whole thing.    From Wordnik.com.  [Music news, reviews, comment and features | guardian.co.uk] Reference

(gently) Chicago's perpetual, gnawingly inferior notion of itself in relation to New York.    From Wordnik.com.  [chicagotribune.com -] Reference

Go ahead ol’man, take the reins and perhaps one day you’ll find the kind of recognition something gnawingly inside says you need.    From Wordnik.com.  [Two Views of Mexico] Reference

This particular species of miscommunication is more common than writers like to admit — and is all too often the underlying cause of those knuckle-gnawingly frustrating situations where a first reader holds onto a manuscript for so long that the writer’s already taken the book through three more drafts.    From Wordnik.com.  [Author! Author! » Blog Archive » Getting good feedback, part IX: more wrangling with Gladioli] Reference