Antonyms of adj porous

3 senses of porous

Sense 1
porous -- (able to absorb fluids; "the partly porous walls of our digestive system"; "compacting the soil to make it less porous")

INDIRECT (VIA permeable) -> impermeable -- (preventing especially liquids to pass or diffuse through; "impermeable stone"; "an impermeable layer of scum"; "a coat impermeable to rain")

Sense 2
porous (vs. nonporous), poriferous -- (full of pores or vessels or holes)

nonporous (vs. porous) -- (not porous; especially not having vessels that appear as pores; "nonporous wood")

Sense 3
holey, porous -- (allowing passage in and out; "our unfenced and largely unpoliced border inevitably has been very porous")

INDIRECT (VIA leaky) -> tight -- (of such close construction as to be impermeable; "a tight roof"; "warm in our tight little house")

Similarity of adj porous

3 senses of porous

Sense 1
porous -- (able to absorb fluids; "the partly porous walls of our digestive system"; "compacting the soil to make it less porous")
       => permeable (vs. impermeable) -- (allowing fluids or gases to pass or diffuse through; "permeable membranes"; "rock that is permeable by water")

Sense 2
porous (vs. nonporous), poriferous -- (full of pores or vessels or holes)
       => porose -- (forming a continuous series of pores; "a porose hymenium")

Sense 3
holey, porous -- (allowing passage in and out; "our unfenced and largely unpoliced border inevitably has been very porous")
       => leaky (vs. tight) -- (permitting the unwanted passage of fluids or gases ; "a leaky roof"; "a leaky defense system")