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Synonyms

infeasible

American  
[in-fee-zuh-buhl] / ɪnˈfi zə bəl /

adjective

  1. not feasible; impracticable.


infeasible British  
/ ɪnˈfiːzəbəl /

adjective

  1. a less common word for impracticable

"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

Other Word Forms

  • infeasibility noun
  • infeasibleness noun

Etymology

Origin of infeasible

First recorded in 1525–35; in- 3 + feasible

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The FDA already requires randomized controlled trials prior to approving vaccines and most medicines—except when they would be unethical or infeasible, as is the case for rare diseases and terminal cancers.

From The Wall Street Journal • Dec. 3, 2025

Smith, speaking to The Times, stressed that the new guidelines only apply to situations where the Fire Department has deemed evacuations infeasible.

From Los Angeles Times • Nov. 24, 2025

This is then used to generate a probability distribution function which consists of all the feasible and infeasible solutions that are within the constraints of the COP.

From Science Daily • Mar. 25, 2024

Gillian Paull, from Frontier Economics, says the increase is likely to be "challenging", as providers face financial strains and difficulty recruiting staff, "but not infeasible".

From BBC • Nov. 16, 2023

Page 71 This is not a line-for-line translation; that the author found infeasible.

From Unwritten Literature of Hawaii The Sacred Songs of the Hula by Emerson, Nathaniel Bright