impermeable

adjectives

preventing especially liquids to pass or diffuse through
"impermeable stone"; "an impermeable layer of scum"; "a coat impermeable to rain"
impermeable
is derived from
impermeableness
is derived from
impermeability
antonym
permeable
is similar to
having the power, capacity, or quality of retaining water
"soils retentive of moisture"
retentive
is similar to
hindering the penetration of water
"a water-repellent coat"
water-repellent, water-resistant
see also
of such close construction as to be impermeable
"a tight roof"; "warm in our tight little house"
tight
see also
not admitting of passage or capable of being affected
"a material impervious to water"; "someone impervious to argument"
imperviable, impervious