Potential answers for "Harder to penetrate"

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

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