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