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impractical

[im-prak-ti-kuh l]
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adjective
  1. not practical or useful.
  2. not capable of dealing with practical matters; lacking sense.
  3. idealistic.
  4. impracticable.

Origin of impractical

First recorded in 1860–65; im-2 + practical
Related formsim·prac·ti·cal·i·ty, im·prac·ti·cal·ness, noun
Can be confusedimpossible impracticable impractical improbable
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for impractical

impractical

adjective
  1. not practical or workablean impractical solution
  2. not given to practical matters or gifted with practical skillshe is intelligent but too impractical for commercial work
Derived Formsimpracticality or impracticalness, nounimpractically, adverb
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 impractical

adj.

1823, from assimilated form of in- (1) "not, opposite of" + practical. Impracticable in the same sense dates from 1670s.

Online Etymology Dictionary, © 2010 Douglas Harper