unachievable unattainable undoable unrealizable
unachievable%5:00:00:impossible:00 unattainable%5:00:00:impossible:00 undoable%5:00:00:impossible:00 unrealizable%5:00:00:impossible:00
nedosegljiv neizpeljiv neizpolnljiv neizvedljiv
impossible to achieve
an unattainable goal