impermeable

im·per·me·able

adj \(ˌ)im-ˈpər-mē-ə-bəl\

Definition of IMPERMEABLE

: not permitting passage (as of a fluid) through its substance; broadly : impervious

— im·per·me·abil·i·ty \-ˌpər-mē-ə-ˈbi-lə-tē\ noun

Examples of IMPERMEABLE

1. an impermeable layer of rock
2. a fabric impermeable to moisture

Origin of IMPERMEABLE

Late Latin impermeabilis, from Latin in- + Late Latin permeabilis permeable

First Known Use: 1697

Related to IMPERMEABLE

Synonyms: impassable (also impassible), impenetrable, impervious, impregnable

Antonyms: negotiable, passable, penetrable, permeable

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

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