unrealistic

US /ˌʌn.riː.əˈlɪs.tɪk/
UK /ˌʌn.riː.əˈlɪs.tɪk/
1.

không thực tế

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.