Related Clues:

• Laborious
• Baffling
• Word spelled phonetically by the starts of 1-, 20-, 27-, 36-, 49- and 56-Across
• Opposite of soft
• Like some cider
• Rocky
• Complicated
• Merciless
• Type of candy or cider
• Challenging
• Not a walk in the park
• "A __ Day's Night"
• Not a breeze
• Troublesome
• Hardly a no-brainer