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Unobtainable (adjective)
Unable to be obtained: not able to be acquired or reached.
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Unobtainable (noun)
Someone or something that cannot be obtained.
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Unattainable (adjective)
Impossible to attain or reach; unable to accomplish
“inaccessible|unobtainable|unapproachable”
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Unattainable (noun)
Anything that cannot be attained.
Wiktionary
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Unobtainable (adjective)
not able to be obtained
“the book was unobtainable in London so I wrote to the publisher”
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Unattainable (adjective)
not able to be reached or achieved
“an unattainable goal”
Oxford Dictionary