Synonyms of dreamed-up

2 Syllables
made-up, dreamy, abstract, unreal, fancied, ideal, spectral
3 Syllables
fanciful, supposed, fictional, notional, dreamlike, conceptual, quixotic, assumed, fantastic, figmental, shadowy, whimsical, phantasmal, chimeric, phantasmic, fabulous
4 Syllables
delusive, illusive, illusory, chimerical, visionary, legendary, fantastical, apocryphal, deceptive, nonexistent, unsubstantial, theoretical, imagined
5 Syllables
hypothetical, apparitional, mythological, imaginary, supposititious
6 Syllables
hallucinatory, imaginative