impracticable vs impractical: impracticable은 '실행 자체가 불가능한' (cannot be done), impractical은 '비현실적인, 비효율적인' (not sensible/wise, though perhaps possible)의 의미 차이가 있음.
의미변화와 예문
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실행 불가능한
adj
실행 불가능한
M2
Building a bridge across the canyon was deemed impracticable due to the unstable cliffs.