Unattainable
/ˌʌnəˈteɪnəbəl/
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Definition
(adj) Impossible to attain or reach; unable to accomplish
Sentence Examples
I longed for something unattainable.
Man approaches the unattainable truth through a succession of errors.
CEFR Practice Quiz
Some people believe that perfection is an ____ goal, and it is better to focus on being as good as possible today.