unattainable

adj

1. Impossible to attain or reach; unable to accomplish

   “Efficiency for the sake of efficiency, unchallenged authority conferred upon those who know well a few things and ignore everything else, disdain for the ordinary and humble elements that introduce happiness in our lives, worship of unattainable utopiae, are some of the features of the scheme which leads inevitably to the suppression of the eternal gifts bestowed by God upon every human person and to the frightful prospect of being ruled by what he vividly names “the Empire of the Insect.””

noun

1. Anything that cannot be attained.