Potential answers for "Most difficult, as a problem"

⭐⭐⭐⭐ THORNIEST
⭐⭐⭐ POSER
⭐⭐⭐ NUT
⭐⭐⭐ AHARDNUTTOCRACK
⭐⭐⭐ TOUGH
⭐⭐⭐ STUMPER
⭐⭐⭐ CONUNDRUM
⭐⭐⭐ TOUGHNUT
⭐⭐ HARDEST
⭐⭐ STEEPEST

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