Potential answers for "It's not widely understood"

⭐⭐⭐⭐ INJOKE
⭐⭐⭐ ARCANE
⭐⭐ OPAQUE
⭐⭐ ESOTERIC
⭐⭐ RARER
⭐⭐ TACIT
⭐⭐ CLOSESET
⭐⭐ SCARCE
⭐⭐ EASTER
⭐⭐ WILDE

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