fanciful, imaginary, imagined, notional - not based on fact; dubious; "the falsehood about some fanciful secret treaties"- F.D.Roosevelt; "a small child's imaginary friends"; "her imagined fame"; "to create a notional world for oneself" Antonyms:real, existent (indirect, via unreal)
notional, speculative - not based on fact or investigation; "a notional figure of cost helps in determining production costs"; "speculative knowledge" Antonyms:empirical, empiric (indirect, via theoretical)
fanciful, notional - indulging in or influenced by fancy; "a fanciful mind"; "all the notional vagaries of childhood" Antonym:uncreative (indirect, via creative)
conceptional, ideational, notional - being (or being of the nature of) a notion or concept; "a plan abstract and conceptional"; "to improve notional comprehension"; "a notional response to the question" Antonym:concrete (indirect, via abstract)