1) False 2) Misleading 3) Of the nature of a delusion 4) Tending to delude 5) Unrealistic 1) Unrealistic 
• (a.) Apt or fitted to delude; tending to mislead the mind; deceptive; beguiling; delusory; as, delusive arts; a delusive dream.
De·lu'sive adjective [ See Delude .] Apt or fitted to delude; tending to mislead the mind; deceptive; beguiling; delusory; as, delusive arts; a delusive dream. « Delusive and unsubstantial ideas.» Whewell. -- De*lu'sive*ly , 
[adj] - inappropriate to reality or facts
delusive Tending to mislead or to deceive; deceptive.
false adjective inappropriate to reality or facts; `delusive faith in a wonder drug`; `delusive expectations`; `false hopes`
tending to delude; misleading; deceptive: a delusive reply. · of the nature of a delusion; false; unreal: a delusive belief.