unfeasible
1. [ adjective ] not capable of being carried out or put into practice
Synonyms: infeasible unworkable impracticable
Examples:

"refloating the sunken ship proved impracticable because of its fragility" "a suggested reform that was unfeasible in the prevailing circumstances"

Related terms: impossible
Similar spelling:   unpassable
  unappeasable
  unfashionable
  unifacial
  unfeasibility
  unfasten
  unbiased
  unpeaceable
  unfashionably
  unbiassed
  unabashed