Longman Dictionary of Contemporary English - impractical

~ adj 1 an idea, suggestion, or action that is impractical is not sensible because it would be too difficult, too expensive etc  (A 24-hour service would be impractical for a small organization like this.) 2 someone who is impractical is not good at dealing with ordinary practical matters, such as making or repairing things  (a hopelessly impractical man, who couldn't even boil an egg) - impractically adv - impracticality n  (the sheer impracticality of such a large scale screening program)