Adjective

(en adjective)

Having the faculty of reason; endued with reason; rational.

a reasonable being

Just; fair; agreeable to reason.

* {{quote-news

, year=2012 , date=May 27 , author=Nathan Rabin , title=TV: Review: THE SIMPSONS (CLASSIC): “New Kid On The Block” (season 4, episode 8; originally aired 11/12/1992) , work=The Onion AV Club citation , page= , passage=The episode also opens with an inspired bit of business for Homer, who blithely refuses to acquiesce to an elderly neighbor’s utterly reasonable request that he help make the process of selling her house easier by wearing pants when he gallivants about in front of windows, throw out his impressive collection of rotting Jack-O-Lanterns from previous Halloweens and take out his garbage, as it’s attracting wildlife (cue moose and Northern Exposure theme song).}}

Not excessive or immoderate; within due limits; proper.

a reasonable demand, amount, or price

Not expensive; fairly priced.

$20 a bottle is very reasonable for a good wine at a restaurant.

Satisfactory.

Adjective

(en adjective)

Able to be sustained.

Able to be produced or sustained for an indefinite period without damaging the environment, or without depleting a resource; renewable.

* 2008 , Kate L. Harrison, The Green Bride Guide , ISBN 140221345X, page 174 [http://books.google.com/books?id=O5FyqGQmdpUC&pg=PA174&dq=sustainable]:

In addition to the resources listed in the organic and local food sections earlier, a good source of sustainable meat is Heritage Foods USA (heritagefoodsusa.com).

* 2008 August–October, Dawn Brighid, "A Taste of Hope", in Organic Gardening , ISSN 1536-108X, volume 55, number 6, page 73 [http://books.google.com/books?id=S8MDAAAAMBAJ&pg=PA73&dq=%22that+sustainable%22]:

Some critics have asserted that sustainable food is "elitist"; that it's too expensive and not widely available.

* 2010 , , ISBN 9780061718946, page 129 [http://books.google.com/books?id=_-Z6Umuq68EC&pg=PA129&dq=sustainable]:

A city on a hill—or many cities on hills—surrounded by unbroken vistas of beautiful countryside; small, thriving, family-run farms growing organic, seasonal, and sustainable fruits and vegetables specific to the region.