1. the quality or state of being impractical; lack of practicality or usefulness
Usage: uncountable when referring to the general quality; countable when referring to specific impractical things or ideas
2. something that is impractical or not feasible to do or use
Usage: countable sense

Examples

• The impracticality of the plan became clear once we calculated the costs.
• Building a bridge across the ocean would be an impracticality given current technology.
• She appreciated his creativity but pointed out the impracticality of his design.
• The impracticality of public transportation in rural areas remains a challenge.
• Despite its elegance, the proposal suffered from several impracticalities.
• He dismissed the idea due to its obvious impracticality and expense.