| flaky(adjective, happy, perfect, unusual, fantastic) |
| floating(adjective, happy, perfect, fantastic, extravagant) |
| foolish |
| gaseous |
| ghostly(obscure, vague) |
| glamorous(adjective, happy, tender, perfect, fantastic) |
| gossamery |
| grandiose(adjective, perfect, original, ideal, imaginary) |
| high-flown(adjective, intellectual, abstract, unreal, unattainable) |
| hyped up(expression, untrue, developed, fictitious, invented) |
| idealist(adjective, perfect, original, ideal, imaginary) |
| idle(adjective, light, weak, slight, thin) |
| idyllic(adjective, happy, tender, perfect, fantastic) |
| illogical(adjective, false, wild, unreasonable, useless) |
| illusional |
| illusionary |
| imponderable(light, weak, slight, negative, flimsy) |
| impossible(adjective, perfect, wild, unreasonable, useless) |
| impracticable(adjective, wild, unreasonable, useless, absurd) |
| improbable(wild, unreasonable, useless, absurd, abstract) |