Wordnet 3.0
ADJECTIVE (1)
1.
preventing especially liquids to pass or diffuse through;
- Example: "impermeable stone"- Example: "an impermeable layer of scum"- Example: "a coat impermeable to rain"
The Collaborative International Dictionary of English v.0.48:
Impermeable \Im*per"me*a*ble\, a. [Pref. im- not + permeable:
cf. F. imperm['e]able, L. impermeabilis.]
Not permeable; not permitting passage, as of a fluid. through
its substance; impervious; impenetrable; as, India rubber is
impermeable to water and to air. -- Im*per"me*a*ble*ness,
n. -- Im*per"me*a*bly, adv.
[1913 Webster]
WordNet (r) 3.0 (2006):
impermeable
adj 1: preventing especially liquids to pass or diffuse through;
"impermeable stone"; "an impermeable layer of scum"; "a
coat impermeable to rain" [ant: permeable]
Moby Thesaurus II by Grady Ward, 1.0:
46 Moby Thesaurus words for "impermeable":
close, close-knit, close-textured, close-woven, closed, compact,
compacted, compressed, concentrated, concrete, condensed,
congested, consolidated, crammed, crammed full, crowded, dense,
firm, gluey, hard, heavy, hermetic, holeproof, impassable,
impenetrable, impervious, jam-packed, jammed, massive, nonporous,
nonpuncturable, packed, punctureproof, sealed, serried, solid,
substantial, thick, thick-growing, thickset, unpassable,
unperforable, unpierceable, viscid, viscose, viscous