indurate - Definitions from Dictionary.com:

indurate (IN-dur-it; -dyur-) adjective

Hardened; obstinate; unfeeling.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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adj : emotionally hardened; "a callous indifference to suffering"; "cold-blooded and indurate to public opinion" [syn: callous, thick-skinned, pachydermatous]

Source: WordNet ® 2.0, © 2003 Princeton University