adjective
1.
incapable of dealing prudently with practical matters
a very impractical person whose checkbook never balanced
Synonyms: ivory-tower, ivory-towered, ivory-towerish, nonrealistic, unpractical, unrealistic, viewy
Related Word: idealistic, otherworldly, quixotic, romantic, starry-eyed, visionary
Contrasted words: commonsensible, commonsensical, realistic, sensible, worldly-wise
Antonyms: practical
2.
Synonyms: impracticable 2, nonfunctional, unfunctional, unserviceable, unusable, unworkable, useless
Antonyms: practical
3.
Synonyms: impossible 1, impracticable, infeasible, irrealizable, unattainable, unfeasible, unrealizable, unworkable