If you say that someone is being unrealistic, you mean that they do not recognize the truth about a situation, especially about the difficulties involved in something they want to achieve. There are many who feel that the players are being completely unrealistic in their demands.
What is an unrealistic idea?
having a wrong idea of what is likely to happen or of what you can really do; not based on facts: I think these sales forecasts are unrealistic, considering how slow sales are at present.
What is the synonym of unrealistic?
impractical, impracticable, unworkable, unfeasible, non-viable. unreasonable, irrational, illogical, senseless, silly, improbable, impossible, foolish, fanciful, wild, absurd, delusory, quixotic. idealistic, utopian, far-fetched, perfectionist, unworldly, romantic, starry-eyed, visionary.