unachievable
adjective
UK/ˌʌn.əˈtʃiː.və.bᵊl/
US/ˌʌn.əˈtʃiː.və.bᵊl/
Definitions of unachievable adjective
Impossible to accomplish or attain.
The goal is unachievable given the current technological limitations.
Their expectations were too high, leading to many unachievable objectives.
Trying to complete all these tasks in a short amount of time is unachievable.