adj.

1. Unwise to implement or maintain in practice: Refloating the sunken ship proved impractical because of the great expense.
2. Incapable of dealing efficiently with practical matters, especially finances.
3. Not a part of experience, fact, or practice; theoretical.
4. Impracticable. See Usage Note at impracticable.

impracticality im·prac'ti·cal'i·ty (-kăl'ĭ-tē) or im·prac'ti·cal·ness n.

adjective

1. Not capable of happening or being done: impossible, impracticable, unattainable, unrealizable, unthinkable, unworkable. Idioms: out of the question. See possible/impossible.
2. Incapable of dealing efficiently with practical matters: ivory-tower. See thrive/fail/exist.
3. Incapable of being used or availed of to advantage: impracticable, unnegotiable, unserviceable, unusable, unworkable, useless. See used/unused.

IN BRIEF: Not useful or efficient.

More than an end to war, we want an end to the beginning of all wars — yes, an end to this brutal, inhuman and thoroughly impractical method of settling the differences between governments. — Franklin D. Roosevelt, American statesman, 32nd U.S. president.

Note: click on a word meaning below to see its connections and related words.

The adjective has 2 meanings:

Meaning #1: not practical; not workable or not given to practical matters
  Antonym: practical (meaning #1)

Meaning #2: not practical or realizable; speculative
  Synonyms: airy, visionary

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Dansk (Danish)
adj. - upraktisk, unyttig, uigennemførlig

Nederlands (Dutch)
onpraktisch

Français (French)
adj. - impraticable, peu réalisable, peu réaliste, qui manque d'esprit pratique

Deutsch (German)
adj. - unpraktisch, unbrauchbar

Ελληνική (Greek)
adj. - μη πρακτικός, ατελέσφορος, άσκοπος

Italiano (Italian)
poco pratico

Português (Portuguese)
adj. - não prático

Русский (Russian)
непрактичный

Español (Spanish)
adj. - poco práctico, teórico

Svenska (Swedish)
adj. - opraktisk, ogenomförbar

中文（简体） (Chinese (Simplified))
不切实际的, 不现实的, 无用的, 缺乏常识的

中文（繁體） (Chinese (Traditional))
adj. - 不切實際的, 不現實的, 無用的, 缺乏常識的

한국어 (Korean)
adj. - 비실용적인, 실제에 어두운

日本語 (Japanese)
adj. - 実用的でない

العربيه (Arabic)
‏(صفه) غير عملي‏

עברית (Hebrew)
adj. - ‮לא-מעשי‬

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