Potential answers for "Tough person to understand"

⭐⭐⭐⭐ ENIGMA
⭐⭐⭐ ARCANE
⭐⭐ HARDNUT
⭐⭐ NAILS
⭐⭐ HARDCASE
⭐⭐ EATER
⭐⭐ EGOTIST
⭐⭐ CLAM
⭐⭐ SAYDIE
⭐ DEFENDER

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