Impracticable means not able to be carried out. An impracticable plan.
It is different from impractical, which means unwise rather than impossible. Something impracticable cannot be done at all, whatever anybody is willing to spend.
1adjectiveimpracticableNot able to be carried out.
“The timetable was impracticable and everybody said so at the first meeting.”
impracticable is a quality.
From in- + practicable.
Etymology from Wiktionary, CC BY-SA