Impenetrable

[adj] impossible to understand; "impenetrable jargon"
[adj] not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"
[adj] permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"

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Synonyms

dense, heavy, incomprehensible, thick, uncomprehensible

Antonyms

penetrable

Related Terms

ambiguous, arcane, beyond reach, beyond understanding, cabalistic, close, closed forever to, closed to, close-knit, close-textured, close-woven, compact, compacted, compressed, concentrated, concrete, condensed, congested, consolidated, crammed, crammed f