| abstract(adjective, intellectual, unreal, unattainable) |
| chimerical(adjective, intellectual, abstract, unreal, unattainable) |
| conceptual impractical(expression, adjective, intellectual, abstract, unreal) |
| dreamlike(adjective, intellectual, abstract, unreal, unattainable) |
| extravagant(adjective, intellectual, abstract, unreal, unattainable) |
| fanciful(adjective, intellectual, abstract, unreal, unattainable) |
| fictitious(adjective, intellectual, abstract, unreal, unattainable) |
| high-flown(adjective, intellectual, abstract, unreal, unattainable) |
| hypothetical(adjective, intellectual, abstract, unreal, unattainable) |
| ideal(adjective, intellectual, impractical, unreal, unattainable) |
| imaginary(adjective, intellectual, abstract, unreal, unattainable) |
| in the clouds(expression, adjective, idiom, intellectual, unreal) |
| ivory-tower(adjective, intellectual, abstract, unreal, unattainable) |
| mental(adjective, intellectual, abstract, unreal, unattainable) |
| mercurial(adjective, intellectual, abstract, unreal, unattainable) |
| notional(adjective, intellectual, abstract, unreal, unattainable) |
| quixotic(adjective, intellectual, abstract, unreal, unattainable) |
| theoretical(adjective, intellectual, abstract, unreal, unattainable) |
| transcendent(adjective, intellectual, abstract, unreal, unattainable) |
| transcendental(adjective, intellectual, abstract, unreal, unattainable) |