| starry-eyed(adjective, silly, impractical, unlikely, unreal) |
| storybook(adjective, fake, false, imaginary, fanciful) |
| strange(adjective, extraordinary, unbelievable, implausible, unthinkable) |
| suppositious(adjective, fake, false, imaginary, fanciful) |
| supposititious(adjective, fake, false, imaginary, fanciful) |
| suspect(adjective, unreasonable, dubious, unlikely, flimsy) |
| too much(expression, adjective, unreasonable, dubious, unlikely) |
| unconceivable(adjective, implausible) |
| unheard of(expression, adjective, belief, impossible, inconceivable) |
| unimaginable(adjective, extraordinary, strange, unbelievable, implausible) |
| unreasonable(adjective, dubious, unlikely, flimsy, unbelievable) |
| unworkable(adjective, silly, impractical, unlikely, unreal) |
| visionary(adjective, fake, false, imaginary, fanciful) |
| weird(imaginary, illusory, dreamlike) |