infeasible
1. [ adjective ] not capable of being carried out or put into practice
Synonyms: unfeasible 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:   invisible
  infeasibility
  invisibleness
  investiture
  investigate
  invisibility
  investing
  invested
  invasive
  infested
  invisibly
  in-basket
  in_passing