Definition of "perspicacious" [per•spi•ca•cious]

• Having or showing penetrating mental discernment; clear-sighted. See Synonyms at shrewd. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Regardless of the fact that you don't know what the word perspicacious means, you continue to amaze me."
• "Martin also squeezes the word "perspicacious" into his first paragraph, and drops the dime "pleonastic" later on."
• "Anyone who proselytises on behalf of the enemy in a time of war can hardly be described as 'perspicacious' regardless of their race or religion (or lack thereof)."