incapable of being put into practice or accomplished; not feasible
2.
unsuitable for a desired use; unfit
3. an archaic word for intractable
unpracticable in American English
(unˈpræktɪkəbəl)
adjective
impracticable
Derived forms
unpracticabilityunpracticableness
noun
unpracticably
adverb
Word origin
[1640–50; un-1 + practicable]This word is first recorded in the period 1640–50. Other words that entered Englishat around the same time include: elevator, generator, intrigue, liaison, tonicun- is a prefix meaning “not,” freely used as an English formative, giving negative oropposite force in adjectives and their derivative adverbs and nouns (unfair; unfairly; unfairness; unfelt; unseen; unfitting; unformed; unheard-of; un-get-at-able), and less freely used in certain other nouns (unrest; unemployment)