impenetrable

1 impossible to get through or into the ancient temple was surrounded by vast stretches of impenetrable jungle Synonyms of impenetrable impassable (also impassible), impermeable, impervious, impregnable Words Related to impenetrable close, compact, dense, thick, tight; compressed, condensed; sturdy, substantial, tough; firm, frozen, hard, solid, stiff; inflexible, rigid, unbending, unyielding Near Antonyms of impenetrable soft, squishy; bendable, elastic, flexible, giving, malleable, pliable, yielding; absorbent, porous Antonyms of impenetrable negotiable, passable, penetrable, permeable

2 being beyond one's powers to know, understand, or explain the mysteries of that religion are completely impenetrable to outsiders Synonyms of impenetrable arcane, cryptic, deep, enigmatic (also enigmatical), mysterious, inscrutable, mystic, occult, uncannyWords Related to impenetrable dark, darkling, fuzzy, murky, obscure, shadowy, vague; ambiguous, equivocal; imponderable, incomprehensible, unfathomable, unintelligible, unsearchable; inexplicable, unaccountable, unexplainable; unanswerable, unknowable; metaphysical, mystical, numinous, supernatural; abstruse, esoteric, recondite; baffling, befuddling, bewildering, confounding, confusing, disorienting, mystifying, perplexing, puzzlingNear Antonyms of impenetrable fathomable, intelligible, understandable; apparent, clear, evident, manifest, obvious, open-and-shut, palpable, patent, perspicuous, plain, straightforward, transparent, unambiguous, unequivocal, unmistakable

3 impossible to understand the textbook's language is completely impenetrable, at least to me Synonyms of impenetrable incomprehensible, unfathomable, ungraspable, unintelligibleWords Related to impenetrable abstruse, enigmatic (also enigmatical), esoteric, indecipherable, inscrutable, recondite, unsearchable; cryptic, darkling, deep, mysterious, mystic, oblique, obscure, occult, uncanny; unanswerable, unknowable; baffling, bewildering, confounding, confusing, mystifying, perplexing, puzzling; inconceivable, unimaginable, unthinkableNear Antonyms of impenetrable basic, elemental, elementary, essential, fundamental, rudimentary, underlying; easy, simple; coherent, connected, ordered, orderly, organized, systematic, systematized; clear, cogent, compelling, convincing, lucid, pellucid, perspicuous, plain, straightforwardAntonyms of impenetrable fathomable, intelligible, understandable

4 not allowing penetration (as by gas, liquid, or light) the container of toxic waste has an impenetrable seal to prevent leaks Synonyms of impenetrable tight, impermeable, imperviousWords Related to impenetrable close, compact, dense, snug, thick; airtight, hermetic (also hermetical), leakproof, watertight; lightproof, soundproof, waterproofNear Antonyms of impenetrable absorbent, leaky, porous, unsealedAntonyms of impenetrable penetrable, permeable, pervious