unfeasible
Definitions
Not capable of being done or carried out easily or conveniently.
Impractical or unlikely to be successful.
Examples
The committee decided that the proposed timeline for the project was completely unfeasible.
It is unfeasible to expect the team to finish such a complex task in only two hours.
Synonyms
impractical impossible unworkable unattainable nonviable implausible hopeless
Antonyms
feasible practical achievable attainable viable possible realistic