[ in-fee-zuh-buh l ]
/ ɪnˈfi zə bəl /


not feasible; impracticable.

Origin of infeasible

First recorded in 1525–35; in-3 + feasible
Related formsin·fea·si·bil·i·ty, in·fea·si·ble·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infeasible

  • With good pupils it is not infeasible to read the whole of the Odyssey, since facility increases very rapidly toward the end.

    Outlines of Educational Doctrine|John Frederick Herbart
  • He sought to talk discontentedly of the project, as if he found it infeasible.

    The Story of Old Fort Loudon|Charles Egbert Craddock
  • The commander also rejects, at this point, courses of action found to be infeasible of accomplishment.

    Sound Military Decision|U.s. Naval War College

British Dictionary definitions for infeasible


/ (ɪnˈfiːzəbəl) /


a less common word for impracticable
Derived Formsinfeasibility or infeasibleness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for infeasible



1530s, from in- (1) "not, opposite of" + feasible.

Online Etymology Dictionary, © 2010 Douglas Harper