- Ample basis stupidly blocked - Blocked - Insurmountable - Reachable - Unable to be crossed - Incapable of being passed; not admitting a passage; as,
an impassable road, mountain, or gulf.
- Cruise mission described as unachievable - Hopeless (situation) - Insurmountable - non viable - Not able to be done or to happen - Unbearable - Not possible; incapable of being done, of existing,
etc.; unattainable in the nature of things, or by means at command;
insuperably difficult under the circumstances; absurd or impracticable;
not feasible.