| impracticable(adjective, wild, silly, unreasonable, useless) |
| improbable(adjective, wild, silly, unreasonable, absurd) |
| in the clouds(expression, adjective, idiom, intellectual, unreal) |
| inapplicable(adjective, wild, unreasonable, useless, absurd) |
| inefficacious(adjective, wild, unreasonable, useless, absurd) |
| infeasible(adjective, wild, unreasonable, useless, absurd) |
| inoperable(adjective, wild, unreasonable, useless, absurd) |
| intellectual(adjective, abstract, unreal, unattainable) |
| mental(adjective, intellectual, abstract, unreal, unattainable) |
| mercurial(adjective, intellectual, abstract, unreal, unattainable) |
| nonfunctional(adjective, wild, unreasonable, useless, absurd) |
| nonrealistic(adjective, silly, impractical, unlikely, dreamy) |
| nonviable(adjective, wild, unreasonable, useless, absurd) |
| not sensible(expression, adjective, silly, dreamy, unreal) |
| notional(adjective, intellectual, abstract, unreal, unattainable) |
| on cloud nine(expression, adjective, idiom, silly, dreamy) |
| otherworldly(adjective, wild, unreasonable, useless, absurd) |
| out-of-reach(adjective, intellectual, abstract, unreal, unattainable) |
| romantic(adjective, wild, unreasonable, useless, absurd) |
| speculative(adjective, wild, unreasonable, useless, absurd) |