Related Clues:

• Difficult to penetrate
• Like some scary alleys
• Like Wrigley Field until 1988
• Kept in the dark
• Darker than dim
• Sober?
• Like a dark room
• Like some pilots in summer?
• Not aflame
• Not matched up?
• Like a burned-out bulb
• Dark, as a room
• Not ignited
• Like the inside of a coffin
• Like a new cigarette