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adj. brit·tler, brit·tlest
a. Likely to break, snap, or crack, as when subjected to pressure: brittle bones.
b. Easily damaged or disrupted; fragile: a brittle friendship. See Synonyms at fragile.
a. Difficult to deal with; snappish: a brittle disposition.
b. Lacking warmth of feeling; cold: a reputation for being brittle and aloof.
3. Brilliantly sharp, as in percussive sound.
a. Perishable.
b. Fleeting; transitory.
A confection of caramelized sugar to which nuts are added: walnut brittle.

[Middle English britel, probably from Old English *brytel, from bryttian, to shatter.]

brit′tle·ly (brĭt′l-ē) adv.
brit′tle·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The Kentland (Newton County Stone) quarry exposes steeply dipping, brittlely deformed, Ordovician-Silurian rocks in the central uplift of a complex crater, which has been highly eroded and buried.
One fears that the advantages of Piano's celebrated modesty may be short-lived, and that his larger museums, though often brittlely elegant, may lack the strong aesthetic integrity needed to endure architecture's very long run.