Ivory-tower and No-go

Ivory-tower adjective - Very learned or educated but inexperienced in practical matters.

No-go and ivory-tower are semantically related in impracticable topic. In some cases you can use "No-go" instead an adjective phrase "Ivory-tower", when it comes to topics like unrealistic.

No-go adjective - Not functioning properly or in suitable condition for proceeding.

Ivory-tower and no-go are semantically related in impracticable topic. Sometimes you can use "Ivory-tower" instead an adjective phrase "No-go", if it concerns topics such as unrealistic.