- Impracticable
- Nonviable
- An empty space
- Completely empty
- Empty
- Empty space
- Gap
- Lacking, ... of
- nonviable
- Desperate
- Incompetent
- Irremediable
- It's futile without comedian Bob
- It’s futile without comedian Bob
- nonviable
- Very bad or incompetent
- Absurd
- Far-fetched
- Impractical
- nonviable
- Pie-in-the-sky
- Pie-in-the-sky airline cuts need refining
- Unworkable
- Nonviable
- Not sensible
- Unrealistic
- Unusable
- Unworkable
- Useless
- Not practical.