ivory tower
[adjective]
Synonyms: impractical, ivory-towered, ivory-towerish, nonrealistic, unpractical, unrealistic, viewy

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Antonyms: down-to-earth

[TahlilGaran] English Synonym Dictionary ▲

ˌivory ˈtower noun [countable]
a place or situation where you are separated from the difficulties of ordinary life and so are unable to understand them, used especially to describe a college or university ⇒ academia:
an academic in an ivory tower

[TahlilGaran] Dictionary of Contemporary English ▲

an ivory tower
if you are in an ivory tower, you are in a place or situation where you are separated from ordinary life and its problems

[TahlilGaran] English Idioms Dictionary ▲