unachievableadjective
uk/ˌʌnəˈtʃiːvəbl/usnot able to be done, reached, or finished successfully:
Doubling our sales figures in the next year is an unachievable goal.
Many critics believe that unbiased journalism is unachievable.
英语词典包含110679条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。