Longman Dictionary of Contemporary English homepage

unrealistic

 adjective
     
un‧rea‧lis‧tic
unrealistic ideas or hopes are not reasonable or sensible
it is unrealistic to do something
It is unrealistic to expect these changes to happen overnight.
Some parents have totally unrealistic expectations of teachers.
—unrealistically adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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