impractical

Something impractical is difficult or impossible to achieve. It might sound like a great idea, but it's not going to happen. It's just not practical.

Impractical ideas make no sense or just can’t be done. Heels so high you have a fish swimming in them are cool, but very impractical. Trying to drive from New York to California in four hours, which could never happen, is impractical. Something impractical is not likely to work. Practical ideas are feasible, but impractical ideas are based on wishful thinking. When someone tells you an idea is impractical, she’s saying, "Get real."

Definitions of impractical
  1. adjective
    not practical; not workable or not given to practical matters
    “refloating the ship proved impractical because of the expense”
    “he is intelligent but too impractical for commercial work”
    “an impractical solution”
    Synonyms:
    impossible
    not capable of occurring or being accomplished or dealt with
    crazy, half-baked, screwball, softheaded
    foolish; totally unsound
    meshuga, meshugga, meshugge, meshuggeneh, meshuggener
    senseless; crazy
    quixotic, romantic, wild-eyed
    not sensible about practical matters; idealistic and unrealistic
    unfunctional
    not related to or suitable for everyday needs or activities
    unwieldy
    difficult to work or manipulate
    unrealistic
    not realistic
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    Antonyms:
    practical
    concerned with actual use or practice
    concrete
    capable of being perceived by the senses; not abstract or imaginary
    possible
    capable of happening or existing
    applicative, applicatory
    readily applicable or practical
    functional
    designed for or adapted to a function or use
    interoperable
    able to exchange and use information
    matter-of-fact, pragmatic, pragmatical
    concerned with practical matters
    operable, practicable
    usable for a specific purpose
    serviceable
    intended or able to serve a purpose without elaboration
    unimaginative
    dealing only with concrete facts
    working
    adequate for practical use; especially sufficient in strength or numbers to accomplish something
    realistic
    aware or expressing awareness of things as they really are
    serviceable
    ready for service or able to give long service
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  2. adjective
    not practical or realizable; speculative
    synonyms: Laputan, airy, visionary, windy
    utopian
    characterized by or aspiring to impracticable perfection
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