Potential answers for "It's hard to penetrate"

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

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