unporous
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unporous — adjective Not porous. Syn: nonporous … Wiktionary
unporous — adj.; unporousness, n … Useful english dictionary
impenetrable — adj 1. impervious, imperviable, impassable, unpassable, inaccessible, unaccessible, jungly, jungled, overgrown; trackless, pathless, wayless, untrodden, Obs. invious. 2. proof, resistant, tight, snug, compact, hermetic, hermetically sealed;… … A Note on the Style of the synonym finder
impermeable — adj 1. impenetrable, impassable, impervious, imperviable, inaccessible; jungly, jungled, overgrown; trackless, pathless, wayless, untrodden, Obs. invious. 2. proof, resistant, tight, airtight, snug, compact, hermetic, hermetically sealed; closed … A Note on the Style of the synonym finder
impervious — adj 1. impassable, impenetrable, impermeable, inaccessible, imperviable; jungly, jungled, overgrown; trackless, pathless, wayless, untrodden. 2. proof, resistant, tight, airtight, snug, compact, hermetic, hermetically sealed; closed, shut, locked … A Note on the Style of the synonym finder
staunch — adj 1. firm, steadfast, unflinching, unswerving, unwavering, undeviating, unshrinking, unbending, unbowing, unfaltering, unhestitating; constant, dedicated, devoted, true, faithful, sure, dependable, reliable, steady, stable; unshaken, undaunted … A Note on the Style of the synonym finder
tight — adj 1. fixed, fastened, fast, secure, secured, clinched, made fast, set, sound; stable, stationary, unmovable, immovable, irremovable. 2. taut, tense, strained, rigid, stiff; unrelaxed, under a strain, Inf. uptight. 3. snug, close fitting, form… … A Note on the Style of the synonym finder