Antonyms of adj semipermeable

1 sense of semipermeable

Sense 1
semipermeable -- ((of a membrane) selectively permeable)

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

Similarity of adj semipermeable

1 sense of semipermeable

Sense 1
semipermeable -- ((of a membrane) selectively permeable)
       => permeable (vs. impermeable) -- (allowing fluids or gases to pass or diffuse through; "permeable membranes"; "rock that is permeable by water")