an unattainable ideal
Many economists think that full employment is an unattainable goal.
This goal seemed virtually unattainable not long ago.
While ' craft ' was a foil for ' conscience ', virtue and liberty were complemented by - indeed, unattainable without - true religion, which moderated the passions.
Without lump sum transfers, solutions to traditional accounting models founded on utility-based social welfare functions may be unattainable.
One can then ask how she knows that further clarity is unattainable.
It means that certain directions of motion are unattainable and the manipulator loses at least one degree of freedom.
Because the ideal moral character is a construct of reason, it is by definition unattainable by flesh-and-blood characters, who might uncharacteristically slip on occasion.
One problem is that true genetic balance is an unattainable goal, since there is inevitable skewing toward genetic units containing large numbers of languages.
Here there was a trade-off, as a result of which women's organisations achieved some perhaps otherwise unattainable goals, but became prisoners of cardenista political culture.