adj. 25B6; adjective
it is unrealistic to expect changes overnight : IMPRACTICAL, impracticable, unfeasible, non-viable; unreasonable, irrational, illogical, senseless, silly, foolish, fanciful, idealistic, romantic, starry-eyed.
unrealistic images : UNLIFELIKE, non-realistic, unnatural, non-representational, abstract.
pragmatic, lifelike.