Definition of "infeasible" [in•fea•si•ble]

• Not feasible; impracticable. (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.

• "On the contrary, this announcement should encourage the non–Annex I "developing" countries, which have been insisting on a second commitment period, to begin to accept the reality that with the United States, Japan, Russia, and now Canada on record as not endorsing a second commitment period for the Kyoto Protocol, it is infeasible for the European Union to go it alone."
• "Throw a couple errors into the mix and a dictionary attack on a string of characters with no breaks becomes computationally infeasible."
• "Sometimes even the most thought out idea may look like crakpot now or infeasible."