Adjective : chewable aspirin.    From Dictionary.com. 

Noun : Now that the baby is getting its teeth, add chewables to its diet.    From Dictionary.com. 

(Though not the little bits of unchewable tendon.).    From Wordnik.com.  [Profile: Midtown Lunch’er “Florence” | Midtown Lunch - Finding Lunch in the Food Wasteland of NYC's Midtown Manhattan] Reference

Then the caramel got really hard–almost unchewable.    From Wordnik.com.  [caramelized brown butter rice krispie treats | smitten kitchen] Reference

They were tough and bitter, really unchewable almost.    From Wordnik.com.  [shaker lemon pie | smitten kitchen] Reference

I threw away most of it because it was simply unchewable.    From Wordnik.com.  [Yushi Bento Bar Brings Style Over Substance to Midtown | Midtown Lunch - Finding Lunch in the Food Wasteland of NYC's Midtown Manhattan] Reference

It looked and smelled sooo delish, but I got stuck on the unchewable bit of skin with hair still attached.    From Wordnik.com.  [A Tasty Sandwich Near Siena - Bitten Blog - NYTimes.com] Reference

But such is the banality of his veg selection - potato, carrot and absolutely unchewable fibrous fennel - that it might turn even the most committed meat-avoider carnivorous.    From Wordnik.com.  [The Globe and Mail - Home RSS feed] Reference

"They're special ones, made of leather, quite unchewable.    From Wordnik.com.  [The Rockingdown Mystery]

I got one lump of unchewable gristle in there.    From Wordnik.com.  [Your First Look at the Frites N Meats Burger | Midtown Lunch: Downtown NYC] Reference

It is very very hard and unchewable.    From Wordnik.com.  [VictoriaC Blog] Reference

Slimy unchewable stuff.    From Wordnik.com.  [AfterEllen.com - Because visibility matters] Reference