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impenetrable

adjective

1 impenetrable

Not admitting of penetration or passage into or through.

Roget 664: safe, secure, sure; in safety, in security; on the safe side; under the shield of, under the shade of, under the wing of, under the shadow of one's wing; under cover, under lock and key; out of danger, ... show more

Roget 526: latent; lurking etc. v.; secret etc. 528; occult; implied etc. v.; dormant; abeyant.    ... show more

Roget 261: closed etc. v.; shut, operculated; unopened.    unpierced, imporous, caecal [Med.]; closable; imperforate, impervious, impermeable; impenetrable; ... show more

2 impenetrable

Permitting little if any light to pass through because of denseness of matter:
— Impenetrable gloom.

synonyms: dense, heavy.

Roget 519: unintelligible, unaccountable, undecipherable, undiscoverable, unknowable, unfathomable; incognizable, inexplicable, inscrutable; inapprehensible, incomprehensible; insolvable, insoluble; impenetrable.    ... show more

Roget 321: dense, solid; solidified etc. v.; caseous; pukka; coherent, cohesive etc. 46; compact, close, serried, ... show more

3 impenetrable

Impossible to understand.

Polish: nieprzenikniony


Moby thesaurus: Greek to one, ambiguous, arcane, beyond reach, beyond understanding, cabalistic, close, close-knit, close-textured, close-woven, closed forever to, closed to, compact, compacted, compressed, concentrated, concrete, condensed, congested, consolidated ... show more.

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