Potential answers for "Hard to fluster"

⭐⭐⭐⭐ CALM
⭐⭐⭐⭐ SERENE
⭐⭐⭐⭐ COOL
⭐⭐ ERS
⭐⭐ SOOTHE
⭐⭐ UNGLUE
⭐⭐ BEFAZED
⭐⭐ UNNERVE
⭐⭐ ADDLE

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