Related Clues:
- Without value
- Uncalled for
- Unnecessary
- Not necessary
- Ineffectual
- Of no value
- Inessential
- Like a fifth wheel
- A waste of time
- Serving no purpose
- Environmental slogan, or a hint to this puzzle's theme answers
- Gratuitous
- Good for nothing
- 'The ___ Precaution' (alternate title of 'The Barber of Seville')
- Of no practical application