Potential answers for "Difficult to solve"

⭐⭐⭐⭐ KNOTTY
⭐⭐⭐ PROBLEM
⭐ ERASER
⭐ TOUGHNUTTOCRACK
⭐ UPHILLBATTLE
⭐ ONUS
⭐ HOTSEATS
⭐ MASSE
⭐ EELY
⭐ INPEN

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