Related Clues:

• Unresponsive
• Like a doornail?
• Very cold
• High-IQ
• Completely exhausted
• Word with duck or heat
• Out of bounds
• Quick to learn
• With 111-Down cul-de-sacs,
• Sophisticated
• Feel the pain
• Classic TV's Maxwell
• No longer with us
• Man in C.O.N.T.R.O.L.
• Worse than slow, in retail