having or showing ideas that are different and unusual but not practical or likely to succeed (Cambridge)
having or involving ideas or plans that show imagination but are usually not practical (Oxford)
غیر فطری شیخ چلی
This is a vast, exciting and some say quixotic project.(Cambridge).
Many think these attempts to make lawyers behave are quixotic.(Cambridge)
A quixotic project
Quixotic courage
idealistic
unrealistic
unworkable
practical
workable
quixotic