B2 having a wrong idea of what is likely to happen or of what you can really do; not based on facts不切实际的;不实事求是的;不现实的
More examples
I think she had unrealistic expectations of motherhood.
Expecting four year old children to sit quietly for a whole hour is just completely unrealistic.
I always have a totally unrealistic idea of what I can fit into a day.
Some parents have completely unrealistic expectations of their children.
It's unrealistic to expect him to make a full recovery overnight.
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