penetrable Antonyms

impenetrable shellproof perplexing obscure mysterious mackintosh irresolvable invulnerable inscrutable incomprehensible incognizable inclosed impervious imperviable impermeable thick unfathomable beyond comprehension waterproofed rustproof rainproof entranceless all-conquering water-resistant nonporous burglarproof raincoat bulletproof light-tight leakproof airtight beyond your ken impassable hermetical complex compact cloudy blockaded bizarre bewildering barred ballproof baffling astonishing arcane ambiguous air-tight advanced complicated curious