Potential answers for "Difficult to penetrate"

⭐⭐⭐⭐ MURKY
⭐⭐ SOAKIN
⭐⭐ ARMOR
⭐⭐ SEEP
⭐⭐ DENSER
⭐⭐ XRAY
⭐⭐ SEEPIN
⭐⭐ DENSE

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