Impossible to achieve or attain: an unachievable goal. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unachievable" in a sentence
"Nine years after the Army's requirement for a new fleet of medium-weight vehicles was identified in the 1998 Strategic Defence Review, the Commons defence committee warns that it may simply be "unachievable"."
"After its revelation in August that the government had been advised that the EU target of 20 percent renewables by 2020 was "unachievable", The Guardian is back on the case claiming that the government is planning to abandon this target."
"Much like President Bush's Kyoto alternative and inaptly named "Clear Skies Initiative," Conservative Prime Minister Stephen Harper's proposed Clean Air Act is filled with industry incentives, lax timetables, and no mention of the Kyoto commitments-something Environment Minister Rona Ambrose deemed "unachievable" in September."