THESAURUS
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
ROGET THESAURUS
impermeable
Closure
N
closure, occlusion, blockade, shutting up, obstruction, embolus, contraction, infarction, constipation, obstipation, blind alley, blind corner, keddah, cul-de-sac, caecum, imperforation, imperviousness, impermeability, stopper, closed, shut, operculated, unopened, unpierced, imporous, caecal, closable, imperforate, impervious,
impermeable, impenetrable, impassable, unpassable, invious, pathless, wayless, untrodden, untrod, unventilated, air tight, water tight, hermetically sealed, tight, snug.
Density
N
density, solidity, solidness, impenetrability, impermeability, incompressibility, imporosity, cohesion, constipation, consistence, spissitude, specific gravity, hydrometer, areometer, condensation, caseation, solidation, solidification, consolidation, concretion, coagulation, petrification, crystallization, precipitation, deposit, precipitate, inspissation, gelation, thickening, indivisibility, indiscerptibility, insolubility, indissolvableness, solid body, mass, block, knot, lump, concretion, concrete, conglomerate, cake, clot, stone, curd, coagulum, bone, gristle, cartilage, casein, crassamentum, legumin, superdense matter, condensed states of matter, dwarf star, neutron star, dense, solid, solidified, caseous, pukka, coherent, cohesive, compact, close, serried, thickset, substantial, massive, lumpish, impenetrable,
impermeable, nonporous, imporous, incompressible, constipated, concrete, knotted, knotty, gnarled, crystalline, crystallizable, thick, grumous, stuffy, undissolved, unmelted, unliquefied, unthawed, indivisible, indiscerptible, infrangible, indissolvable, indissoluble, insoluble, infusible.