impermeable

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adjective

Definition of IMPERMEABLE

1

impossible to get through or into <the wall of security people surrounding the rock band was impermeable>

Synonyms impassable (also impassible), impermeable, impervious, impregnable

Related Words close, compact, dense, thick, tight; compressed, condensed; sturdy, substantial, tough; firm, frozen, hard, solid, stiff; inflexible, rigid, unbending, unyielding

Near Antonyms soft, squishy; bendable, elastic, flexible, giving, malleable, pliable, yielding; absorbent, porous

Antonyms negotiable, passable, penetrable, permeable

2

not allowing penetration (as by gas, liquid, or light) <an impermeable seal on the ancient tomb had preserved the artifacts exceptionally well>

Synonyms impenetrable, impermeable, impervious

Related Words close, compact, dense, snug, thick; airtight, hermetic (also hermetical), leakproof, watertight; lightproof, soundproof, waterproof

Near Antonyms absorbent, leaky, porous, unsealed

Antonyms penetrable, permeable, pervious