劍橋詞典If a course of action , plan , etc. is impracticable, it is impossible to do in an effective way. （行動方案、計劃等）行不通的，不可行的 The changes to the tax system proved impracticable as they were impossible to enforce . 稅制改革因無法實施而被證明是行不通的。 返回 impracticable