Related Clues:

• Uninformative answer?
• Alpine response
• Something repetitive
• Reflection of a kind
• Kind of cardiogram
• Bounce off the walls
• Reminiscent trace
• Radar blip
• Repeated sound
• Narcissus admirer
• Lengthen in duration
• Canyon call
• Sound rebounded
• Many check for it by saying ''Hello!''
• Bounced-back sound