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[in-fee-zuh-buh l] /ɪnˈfi zə bəl/
not feasible; impracticable.
Origin of infeasible
First recorded in 1525-35; in-3 + feasible
Related forms
infeasibility, infeasibleness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for infeasible
Historical Examples
  • He sought to talk discontentedly of the project, as if he found it infeasible.

    The Story of Old Fort Loudon Charles Egbert Craddock
  • 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
  • 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


a less common word for impracticable
Derived Forms
infeasibility, 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
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Word Origin and History for infeasible

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

Online Etymology Dictionary, © 2010 Douglas Harper
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