Related Clues:

• Recyclable item
• Gas gauge warning
• All out
• Vacant
• Like the other part of the half full glass
• Without value
• Undesirable tank level
• Like some threats
• Clear out
• Devoid of content
• Vacuous
• Barren
• Unthreatening, as threats
• Like a growling stomach
• Powerless, as a threat