delusory — tending to delude; misleading; deceptive: a delusive reply.
fanciful — characterized by or showing fancy; capricious or whimsical in appearance: a fanciful design of butterflies and flowers.
fantastic — conceived or appearing as if conceived by an unrestrained imagination; odd and remarkable; bizarre; grotesque: fantastic rock formations; fantastic designs.
fantastical — conceived or appearing as if conceived by an unrestrained imagination; odd and remarkable; bizarre; grotesque: fantastic rock formations; fantastic designs.
hallucinatory — pertaining to or characterized by hallucination: hallucinatory visions.