un ‧ at ‧ tain ‧ a ‧ ble AC /ˌʌnəˈteɪnəb ə l◂/ BrE AmE adjective
[ Word Family: verb : ↑ attain ; noun : ↑ attainment ; adjective : ↑ attainable ≠ ↑ unattainable ]
impossible to achieve:
A military victory is unattainable.
unattainable ideal/dream/goal etc
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THESAURUS
▪ impossible something that is impossible cannot happen or be done:
It’s impossible to get a taxi around here.
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At times, finding a job felt like an impossible task.
▪ impractical something that is impractical is too expensive, takes too much time, is too difficult etc and therefore it is not sensible to try to do it:
It’s a nice idea, but it’s totally impractical.
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We cannot all just stop using our cars - that would be completely impractical.
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an impractical suggestion
▪ out of the question used when saying that something is completely impossible, especially because it is not allowed:
It’s out of the question for you to go alone.
▪ there’s no way informal used when saying that you think something is completely impossible:
There’s no way we can get to the airport in less than an hour.
▪ inconceivable impossible to imagine or believe:
It seemed inconceivable that there could be an end to the fighting in Northern Ireland.
▪ unthinkable impossible to imagine or believe - used especially about something that seems very shocking to people:
In those days it was unthinkable for a lady to work outside the home.
▪ unattainable impossible to achieve:
an unattainable goal
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Victory seemed unattainable.
▪ it can’t be done spoken used when saying very definitely that something is impossible:
I’m afraid it can’t be done.